43,827 免費圖片適用於學生

生物學魚水下動物海上生活野生動物水海洋海洋海

Brownish Fish 2

Yellow perch-1

Ash Meadows Amargosa pupfish-1

Lake trout-1

Short-nose Sturgeon

香港中學生首次自發罷課 (2)

school boy

孩子們學校

Medical Doctor Gives Vaccination to a Girl

Female Student with Fried Noodle Sandwich

Male Student with Smartphone

Close-up of Redbreast Sunfish-2

Ash Meadows Amargosa pupfish-3

Rainbow Trout

Tropical Fish

Close-up of Redbreast Sunfish-1

$Sample of test tubes. A healthcare provider donning a pair of green latex gloves in order to protect herself during her subsequent interaction her next patient. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.$

醫療藥物科學

Dinosaur skull

Amoeba Cell

Graduation Cap. Student hat

Education Cap on White Background

A 3D image of a number of oblong–shaped, Vibrio parahaemolyticus bacteria Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

Gas mask during a nuclear scenario

Nail Clipper

工具類銀色

Teacher Helps His Student Boy

生物學裸體

Graduation Cap

Group A Streptococcus (GAS), Streptococcus pyogenes bacteria, which were atop the surface of a human white blood cell (WBC), known as a neutrophil. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

Blue tang fish

Male bowfin hides in vegetation-1

aquarium

Brook trout in Seneca Creek-1

Rainbow trout-1

醫療藥物科學

Schoolboy Pedestrian is Crossing a Road

十字形制服

Girl is Studying Her Homework

Young brook trout with fall leaves in water-1

Rainbow trout sac fry

Ash Meadows Amargosa pupfish-1

Rainbow trout-7

Young brook trout with fall leaves in water-1

Morone americana

Smallmouth bass-4

野生動物魚

Central stoneroller

The 1950s historical photograph of the inside of an operating room suite during a surgical procedure. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

Yellow-margin triggerfish at Palmyra Atoll National Wildlife Refuge

Dusky Grouper - Epinephelus marginatus

Bluegill close-up

Green Sea Turtle hatchling

野生動物動物

Brook trout in Seneca Creek-4

Yellow Fringed Orchid-3

Brook Trout juvenile-3

The remnant pilings of a long-gone dock appear to float in air due to their reflection in the blue, still water of a pond near NASA Kennedy Space Center.

Plant

Ash Meadows Amargosa pupfish-1

Dental Hygiene Toothbrush

Biologist searches for freshwater mussels

Domestic Training Course for healthcare workers. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

Panama City crayfish-1

Biologist monitors aquatic plants-1

Biologist searches for freshwater mussels-1

Florida applesnail

Pink Pattern Colorful Background

數字的模式

Biologist monitors aquatic plants

Aquarium fish

Student Launch Challenge

外太空火箭

Female Student

2 months moving east

香港中學生首次自發罷課 (12)

Rows of standing graduates in Madison, Wisconsin

Graduates getting into seats in Madison, Wisconsin

Biologist monitors aquatic plants-1

Ash Meadows Speckled Dace-1

Domestic Training Course for healthcare workers. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

Washing Soap Blue

Calm male tourist is standing outdoor in airport and looking at airplanes.

Vision Test

Bocaccio rockfish - Sebastes paucispinis

Brook trout-6

Bluegill on nest-1

野生動物魚

Mountain madtom

Ash Meadows Amargosa pupfish-2

Student Girl Cries in Depression

Male Student is Holding His Smartphone

Male Student is Thinking

school girl

孩子們學校

Medical Doctor Man

School girl

孩子們學校

School girl

孩子們學校

Slimy sculpin-7

Bull trout-1

Queen angelfish

Brook trout-2

Slimy sculpin-3

Ash Meadows Amargosa pupfish-2

Juvenile atlantic salmon

Ash Meadows Amargosa pupfish-3

School girl

孩子們學校

School girl

孩子們學校

Three test tubes used in a Legionella pneumophila bacteria detection test. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

Gas mask during a nuclear scenario

1901 - 2000 共 43,827 下一頁

/ 439