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Many sleepers were fixed on a railway. 一條鉄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)枕木竝已通過了試騐。