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B-13：be on one's back 卧病

A：Where's Peter? I haven't seen him for quite a few days.
A: 彼得在哪儿呢？我好几天没见着他了。

B: He's on his back now.
B：他卧床不起了。

A: I'm sorry to hear that. But he was all right last week.
A: 真不愿听到这个。但上周还好好的呢。

B: Yeah, he was caught in the rain the other day. He has got a very had cold.
B: 是呀，那天下了场雨，得了重感冒。