評論
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重點講解：
1.a couple of days 幾天
例句：He stayed in London for a couple of days.
他在倫敦呆了幾天。
2.be exposed to 暴露在
例句：It sounds reasonable that when someone runs up and down , the body is exposed to more drops of water .
這聽起來似乎不無道理，因為人們在跑動時，身體暴露得多，淋到的雨也多。
3.be warm with ...的需求
例句：It was really windy, and we kept telling him it would be warm with three people in the tent.
晚上風很大，而且我們一個勁兒的告訴他三個人在帳篷里一定會很暖和。
4.on a diet of 以。。為食
例句：The Irish used to live on a diet of potatoes.
愛爾蘭人過去用馬鈴薯作為主食。
