back sizing

• 背涂

back sizing的用法和样例：

例句

1. Please help me put some sunscreen on my back.
   请帮我在背上涂些防晒油。
2. What happens if you tie a piece of buttered toast on a cat's back and drop them from a balcony.
   如果你将一片涂了黄油的面包绑在猫的背上，把它们从阳台上扔下去，会怎么样呢。