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相比之下，医学研究者非常注意使药物试验不透明。
Medical researches, by contrast, take great care to make drug trials blind.
youdao
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使玻璃材料变得易脆或不透明。
The transmission of light through a translucent material.
youdao
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使玻璃材料变得易脆或不透明。
The transmission of light through a translucent material.
youdao