单词：sleepers
n a spy or saboteur or terrorist planted in an enemy country who lives there as a law-abiding citizen until activated by a prearranged signal
n an unexpected achiever of success
n one of the cross braces that support the rails on a railway track
n a passenger car that has berths for sleeping
n pajamas with feet; worn by children
n a piece of furniture that can be opened up into a bed
n tropical fish that resembles a goby and rests quietly on the bottom in shallow water
n an unexpected hit
sleepers的用法和样例：
例句
- Many sleepers were fixed on a railway.一条铁路上有许多固定了的枕木。
- Pre-stressed concrete sleepers that have been designed to replace the conventional wooden ones have been tested.预应力混凝土枕木用来替代传统的木质枕木并已通过了试验。
词汇搭配
- pitch of sleepers轨枕间距
- distance gauge for sleepers枕距规
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