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重点讲解：
1. for sale
供出售；待售；
eg. His former home is for sale at £495,000.
他的旧居要以 49。5 万英镑的价格出售。
eg. The company is not for sale.
该公司不准备出售。
2. in back
汽车（或建筑物等）的后部；
eg. She hurried to the kitchen in back of the store.
她赶紧进到商店后面的厨房。
eg. Catlett got behind the wheel and I sat in back.
卡特利特开车，我坐在车子后面。
3. yell out
（常指因激动、生气或痛苦）叫喊，大喊，吼叫；
eg. Don't squeeze his hand; it makes him yell out in pain.
不要挤他的手，他会疼得高声喊叫。
eg. Sometimes, I yell out of sheer frustration.
有时，我因为挫折大喊大叫。
n. 肩膀，肩部
v. 扛，肩负，承担，(用肩
