3. And many naturally produced chemicals, though occurring in tiny amounts, prove in laboratory tests to be strong carcinogens-a substance which can cause cancer.
【译文】尽管许多自然生成的化学物质分泌量极小,但实验证明却是强致癌物可引起癌症的物质。
【析句】复合句。主句many naturally produced chemicals prove in laboratory tests to be strong carcinogens。主语many...chemicals后,though occurring in tiny amounts作让步状语从句,因为从句和主句主语相同,所以省略了主语。破折号后a substance是carcinogens的同位语,并且which can cause cancer作定语从句修饰a substance。
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