1.sell out 售空
There's often only one of each item in stock at a time, so the pieces can sell out quickly.
這些貨架的商品經常都是一次只上一件，所以很快就會賣完K#~t1x=cTG#xZy。

2.get back into shape 恢復身材
I've decided to change my eating habits and get back into shape.
我決定要改變吃東西的習慣，恢復我苗條的身材rc%;FcoUZn5lwiR^@。

3.on average 通常；平均下來
I am out on business trips twice each month on average and one third of a year I am away from home.
我通常每月都要出差兩次，一年有三分之一時間在外奔波LcA.8NSOw7t%WV。

4.break down to 分解；
Some rocks from volcanoes break down to form black sand.
有些火山巖被撞碎后會形成黑色的沙HTDT,dylhURzrDi!6ui5。