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题库 / Prep2007E1-SC-35
In laboratory rats, a low dose of aspirin usually suffices to block production of thromboxane, which is a substance that promotes blood clotting, but not seriously interfering with the production of prostacyclin, which prevents clotting.
which is a substance that promotes blood clotting, but not seriously interfering
a substance that promotes blood clotting, but not seriously interfering
a substance that promotes blood clotting, but does not seriously interfere
which is a substance to promote blood clotting, but does not seriously interfere
which is a substance that promotes blood clotting, but not a serious interference
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同位语从句是用于说明所修饰名词的具体内容的，它与被修饰词语通常可以划等号；而定语从句是限制所修饰名词的，它的作用是将所修饰的名词与其他类似的东西区别开来：
一点点阿斯匹林就足够阻止T产生，which is a substance that promotes blood clotting，（T物质的）一个特征是防止血凝块； a substance that promotes blood clotting，（T是）一种防止血凝块的物质
这里是对T进行解释，它是一种防止血凝块的物质，而不是描述它的一个特征是防止血凝块
可以可以，精辟
thanks for explanation !
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