单词：concrete lining
concrete lining的用法和样例：
例句
- We have used needle beam telescoping steel form in the Mao-Gong reservoir sediment tunnel in the concrete lining.在庙宫水库排沙洞的衬砌施工中使用了针梁式混凝土衬砌钢模台车。
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讲解文本： concrete 具体的，混凝土的 We still don't have a concrete timeline for the plan. 关于这个计划，我们还没有具体的时间表。 I can't tell you anything concrete. 我也不能跟你说得太具体。 疯狂练习吧！
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