* 醫生有時問：「How often do you expel（或 make 或 pass）gas？」（你放屁的次數很多嗎？）
　　* Is the gas expelled by belching？（是否打嗝后就會放屁呢？）（動詞是 belch）
　　* He said the more he ate, the more he farted.（吃的愈多，放屁也愈多。）
　　* He has passed more gas than usual within the last two days.（過去兩天中，他放屁比平常多。）
　　* Be careful not to fart in the public.（注意在公共場所不可放屁。）

　　至于消化不良，大便不通或拉肚子，也有不同的說法。 例如：

　　* I have an upset stomach.（消化不良） = I have heartburn. = I have indigestion.

　　（注意：Heartburn 是指胃不舒服，不是「心痛」（heartache）
　　* Something has upset my stomach for two weeks.（胃不舒服有兩星期了。）
　　* He has（persistent）constipation.（或 irregularity）（他經常便秘。) 或
　　* He has been unusually constipated.（便秘很反常。）或
　　* He is having problem with irregularity.（或 constipation); 或
　　* He has no bowel movement for the past few days.
　　* He has bouts of diarrhea.=He is having trouble with diarrhea.（他拉了一陣肚子。）
　　* He can see trace of blood and pus or mucus in his stool（或 bowel movement）（大便時可看到血絲和粘膜。）

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