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1·Africans keep a small stick in their mouth to chew or scrub their teeth all day.

非洲人整天把一根小木棍放在嘴里咀嚼或刷洗他们的牙齿。

2·Chew a half stick of gum at a time.

一次只嚼半片口香糖。

3·On the other hand, in older people with dentures, it is often very hard for them to chew properly, so that too large a chunk can easily get down into the throat and stick there.

另一方面，年老有假牙的人，常常难于充分咀嚼，所以过大的食物很容易掉进咽喉并堵在那里。