原因

口臭的主要原因，是舌头后面的细菌，会产生一种带硫的气体，叫硫化物，闻起来像坏鸡蛋。

The main cause of bad breath is bacteria at the back of the tongue, which produce a sulfur gas called sulfur compounds that smells like rotten eggs.

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一个原因是，英国很多商业街上的商店越来越少，比欧洲其他国家少得更快。

One reason is that shops on many British high streets are disappearing, faster than in other European countries.

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一个原因是，很多年来，女孩子都被引导去打垒球，而不是棒球。

One reason is that for many years, girls were steered toward softball instead of baseball.

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它能这么快推广开，一个重要原因是场地很好改。

One important reason it spread so quickly is that courts are easy to convert.

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