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白人研究員身穿白色外套和防護眼鏡的女性在綠色田野中觀看試管
chemical reaction experiment with zinc and acid
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科学家在实验室中使用12通道的管道
chemical reaction producing gas bubbles in liquid
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checking the local water supply with a digital tds and ph meter - isolated on hand and tester
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研究人员的近距离视图 男人手拿着试管在绿色田野中进行害虫控制
白人研究員女士在綠色田野中進行害蟲控制時,戴著防護服拿著試管
研究員身穿防護服,戴防護眼鏡的女性在綠色田野敲打玻璃
chemical reaction producing gas bubbles in test tube
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laboratory assistant conducting research on plants in the field
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品質控制的實驗室工作
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close-up view of woman hands holding a plastic cup
研究人员的后视,手套上的女人在绿色的田野里敲打玻璃
chemical reaction producing gas bubbles in liquid
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白人女性和男性研究人员拿着化学物质和杀虫剂的试管,并在绿色领域使用笔记本电脑
chemical reaction in a test tube
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sea water flows from blue pvc pipe into bubbling fibreglass tank, aquaculture
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白人研究員穿著防護服的男子,在綠色田野中進行害蟲控制時,握著試管
close up view of male hands pouring water into glass
laboratory worker preparing experiment at lab
caucasian woman on the golf course.
video of close up of glass laboratory beakers and dishes with copy space on white background
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a syringe is filled with a liquid
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scientific research. chemist working at modern science lab. test tubes
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an eye creme is mixed in a pharmacy laboratory
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hydrogen gas is bubbeling through a membrane in a plastic cylinder filled with water, small bubbles forming in liquid, slow zoom in
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白人研究員穿著防護服,拿著試管,在綠地進行害蟲控制時使用筆記型電腦
science stock footage
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row of test tubes with liquids and doctor checking sample
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a liquid is placed in a glass bowl
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animation of chemical formulas over hands of caucasian male lab worker
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a cream is mixed in a glass bowl by stirring it
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白人研究員穿著防護服的男子,在綠色田野中進行害蟲控制時,握著試管
白人研究員女士在綠色田野中進行害蟲控制時,戴著防護服拿著試管
研究人員在綠色田野中進行害蟲控制時<unk>坐和握著試管
chemical reaction demonstration in a laboratory setting
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白人研究者身穿防护服的男子在绿色田野中进行害虫控制时拿着试管和树枝
360 ml of a blue chemical cleaner are poured into a measuring cup
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hydrogen gas is bubbeling through a membrane in a plastic cylinder filled with water, small bubbles forming in liquid
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白人研究員,戴著白色外套和護眼鏡的女性,在綠色田野中看試管
pouring water into glasses with ice
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葡萄酒質量檢查實驗室 葡萄酒廠的葡萄酒品質檢測實驗室
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scientist conducting experiment with test tubes
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redheaded doctor in front of camera on gray background.
白人研究人员穿着防护服,手持试管,在绿地进行害虫控制时使用笔记本电脑
scientist mixing chemicals
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一位电影制作人手里拿着一个动作摄像机,拍摄了瑞士河流中的水景
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closeup of a medical research experiment
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化学设备,近距离拍摄蒸<unk>过程中液体滴入接收瓶
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laboratory worker preparing to experiment at lab. pharmaceutical research
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