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
an unexpected achiever of success
one of the cross braces that support the rails on a railway track
a passenger car that has berths for sleeping
pajamas with feet; worn by children
a piece of furniture that can be opened up into a bed
tropical fish that resembles a goby and rests quietly on the bottom in shallow water
an unexpected hit
造句
用作名詞(n.)
Many sleepers were fixed on a railway. 一條鐵路上有許多固定了的枕木。
Pre-stressed concrete sleepers that have been designed to replace the conventional wooden ones have been tested. 預(yù)應(yīng)力混凝土枕木用來替代傳統(tǒng)的木質(zhì)枕木并已通過了試驗(yàn)。