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caucasian man in front of camera on white background.
demonstrating color change with bases using phenolphthalein
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穿着金<unk>的疲倦女孩在健身房与朋友交谈的近距离镜头
chemical reaction inflates balloon with gas
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green liquid pouring into beaker
orbital shaker for mixing, shaking, blending biological samples in plastic flask
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lab glassware on shelves
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coffee shop display with glass water bottles and coffee color chart
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observing color change with bases in science experiment
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observing color change with bases in lab setting
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beer brewing machinery
手用肥<unk>从配送器中掉落的细节
redheaded doctor in front of camera on gray background.
laboratory worker preparing to experiment at lab. pharmaceutical research
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observing color change with bases in lab
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科學家在科學實驗室進行水處理純度測試
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process of production of cocktails
observing color change with bases in lab
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animation of chemistry icons and chemistry beaker on blue background
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demonstrating color change with bases using phenolphthalein
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iv drip
科学家在实验室中使用12通道的管道
scientist handling bottles for a science experiment
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video of close up of glass laboratory beakers and dishes with copy space on white background
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observing color change with bases in lab setting
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laboratory glassware
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student taking notes in a chemistry lab
吸入空氣 進去科學小瓶子
demonstrating color change with bases using phenolphthalein
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新冠病毒疫苗的瓶子
demonstrating color change with bases using phenolphthalein
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observing color change in a chemical reaction
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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
chemical reaction inflates balloon with gas
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clear liquid pouring into beaker
observing color change with bases in lab setting
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scientist demonstrates color change with phenolphthalein
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blue and red liquid pouring into beakers
observing color change in a chemical reaction
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caucasian female doctor in safety goggles and mask holding flask with pills.
scientist conducts naoh reaction in laboratory setting
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scientist demonstrates color change with phenolphthalein
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laboratory worker preparing experiment at lab
redheaded doctor in front of camera on gray background.
塑膠測量圓柱體在實驗室中
establishing shot of machine in a science lab testing chemicals in a clear glass bottle
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redheaded doctor in front of camera on gray background.
observing color change in a chemical reaction
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demonstration of color-changing chemical reactions
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化学品混合在科学瓶中,实验水纯度测试
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