But if they are wrong, an already crowded city will simply gum up.
但如果他们错了的话，这个已经拥挤的城市肯定会更糟糕。
Deposits of plaque build up between the tooth and the gum.
牙菌斑的沉积物在牙齿和牙龈间形成。
Don't wear inappropriate clothing, chew gum, or show up late.
不要穿不合时宜的衣服，嚼口香糖或是面试迟到。
One colleague told me he was sent away after he turned up chewing gum.
有一位同事告诉我：他当时被请走了，没能做成检查，就因为他当时嚼了块口香糖。
One day, I managed to gather up ninety-seven cents worth of bubble gum.
有一天，我估计着拿了七十七美分的泡泡糖。
John balled up the gum and stuck it under his chair.
约翰把口香糖揉成一团，粘在他椅子下面。
Soon, he set up the world's first chewing gum factory.
不久后，他就成立了世界第一家口香糖工厂。
Soon, he set up the world's first chewing gum factory.
不久后，他就成立了世界第一家口香糖工厂。
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