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讲解：
slow (sth / sb) (down / up)
(使)放慢速度,减缓,松劲:
The car slowed down as it approached the junction.
汽车在驶近交叉路口时放慢了速度。
pick up
改善；好转；增强:
Trade usually picks up in the spring.
贸易一般在春天回升。
动词+off
去除某物
He's had his beard shaved off.
他把胡子刮光了。
Take your coat off.
脱了外衣吧。
Don't leave the toothpaste with the top off.
用完了牙膏别让盖子开着。
Receipt for sth
收据，收条
make out (= write) a receipt
写收据
Can I have a receipt, please?
请给我开个收据,好吗？
