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重点讲解：
1. stand up 站起来；起立；
Be careful not to bump your head on the beam when you stand up.
当心站起来时头别撞了横梁。
2. at first 最初；起初；开始时；
At first I couldn't believe it. I thought it was a wind-up by one of my mates.
一开始我不相信，以为是哪个同伴在故意逗我。
3. let go of 松开；放开；
She let go of Mona's hand and took a sip of her drink.
她放开莫娜的手，抿了一口饮料。
4. work out 锻炼；健身；
Work out at a gym or swim twice a week.
一周去健身房锻炼两次，或游两次泳。
n. 瘫痪
