结果表明，大分子链上的氯取代基对分子链进一步氯化起阻碍作用；

The results showed that chloric substituent in polymer chains prevented the chains from further chlorination.

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大量以往研究表明，外语学习焦虑在多数情况下对外语学习起阻碍作用。

Many previous studies show that foreign language anxiety has negative effects on language learning in most cases.

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把它们掺和在一起，并不像你想的那样好。因为一份最新的研究表明，某些维生素会阻碍运动发挥作用。

Put them together and it's not as good as you'd think. Because a recent study shows that some vitamins block the beneficial effects of exercise.

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