1,689 免版税 视频文件,用于"学生"

Dna helix deoxyribonucleic acid
Full HD
00:06
Cell biology education
Full HD
00:10
School student studies
Full HD
00:10
Grass nature green
Full HD
00:24
Artificial insemination human anatomy bench
Full HD
00:04
Dummy preparation students
Full HD
00:31
Bacterium germ bacteria
Quad HD
00:09
Internet cafe library workstations
Full HD
00:12
Cell atom sphere
Full HD
00:37
Hands hygiene soap
Full HD
00:15
Dna genetics molecular biology
Full HD
00:25
Dna genetics clone
Full HD
00:18
Lungs anatomy medical
Full HD
00:15
Hands wash hygiene
Full HD
00:18
Brain education science
Full HD
00:13
To write writing note
Full HD
00:56
Homework girl student
Full HD
00:11
Heart treatment medical
Full HD
00:18
Intestines intestine function
Full HD
00:13
Gloves hospital white
Full HD
00:10
Eye surgery medical
Full HD
00:17
Liver function names
Full HD
00:10
Black black friday background
Full HD
00:10
Dentist device plate
Full HD
00:04
Salmon fish stream
HD
00:08
Solar energy renewable energy solar panel
Full HD
00:30
Kidney function health
Full HD
00:09
Stent process heart
Full HD
00:22
On the table lies a thick textbook homework textbook
Full HD
00:10
Foam sink wet
Full HD
00:54
Dragonfly insects odonata
Full HD
00:12
Human torso brain
Full HD
00:22
Earth globe sea trenches
Full HD
00:14
Earth globe sea trenches
Full HD
00:20
Human body organs
Full HD
01:18
Human skeleton anatomy
Full HD
01:02
Earth science space
Full HD
00:20
Cardiac arrhythmia narrated
Full HD
01:30
Flower of life sacred geometry geometry
Full HD
01:00
Cardiac arrhythmia heart
Full HD
01:11
Mini gastric bypass surgery stomach medical
Full HD
00:20
Cern particle cloud chamber
Full HD
00:19
The lessons are over teacher folder
Full HD
00:18
The lessons are over teacher folder
Full HD
00:23
Space astronomy science
Full HD
00:15
Space science astronomy
Full HD
00:12
Ant insect nature
Full HD
00:30
Space universe astronomy
Full HD
00:12
Leaves branch growing
Quad HD
00:07
Crusader garden arachnids insect
Full HD
00:13
Toxic waste sea
Full HD
00:15
Bumblebee flowers insect
Full HD
00:20
Earth planet planet earth
Full HD
00:08
Flowers nature time
Full HD
00:10
Green branches weeping willow autumn
Full HD
00:08
Space travel nebula
Full HD
00:25
Dishes washing clean
Full HD
00:17
Nebula space galaxy
Full HD
00:16
Heart function anatomy
Full HD
00:17
Frogs animals amphibian
4K
00:19
Atom fusion molecule
Full HD
00:10
Leaves tendril growth
Full HD
00:23
Hemorrhagic brain stroke
Full HD
00:20
Stomach liver intestine
Full HD
00:18
Magnifying glass seek earth
Full HD
00:20
Dental surgery tooth
Full HD
00:12
Solar eclipse moon astronomy
Full HD
00:08
Leaves tree park
HD
00:18
Tree leaves green
HD
00:30
Sun universe earth
Full HD
00:29
Planet earth space
Full HD
00:25
Planet earth space
Full HD
00:20
Planet earth space
Full HD
00:22
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