Mothball在中文里卫生球，樟脑丸。put in mothballs, 就是束之高阁，无限期搁置的意思。
例句：
My son loves the ice skates his grandmother gave him. I don't think he realizes they had been mine when I was his age. Mom had put them in mothballs, not sure if anyone would ever get any use from them. I'm sure glad she'd decided not to throw them out.
我儿子特别喜欢奶奶送他的冰鞋。其实他可能不知道，这双冰鞋是我小时候穿过的，后来被妈妈收了起来，并不知道以后会不会有人能穿。她没把这双冰鞋丢掉，让我太高兴了。
(欢迎在文末下方留言put in mothballs打卡，加强记忆)
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内容来自VOA - Words And Idioms。
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