Another word for this is a " discoloration." Hiro says, " The zipper is also stuck, I think." The " zipper" is the long strip of metal, usually, that you use to keep something together, but also allows you to open something up.

另一个词是“变色” 。 Hiro 说， “我认为拉链也卡住了。” “拉链” 是一条长金属条，通常用于将某些东西放在一起， 但也可以让你打开一些东西。