That's a lot easier to do with lab animals than with children.
在动物身上做试验比在孩子身上做实验要容易得多。
Formaldehyde is a carcinogen that has been shown to cause cancer in lab animals.
甲醛是一种在实验室动物身上被证明会导致癌症的致癌物质。
Formaldehyde is a carcinogen that has been shown to cause cancer in lab animals.
甲醛是一种在实验室动物身上被证明会导致癌症的致癌物质。
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