The Romans were the first to utilize concrete as a building material.
罗马人首先使用混凝土作建筑材料。
We should see if their interest is real and if it is concrete first.
那得先看看他们是不是真的有兴趣。
But we tend to focus on the first one since it is much more concrete.
但是现在我们要朝着前一个更容易完成目标努力。
Fresh concrete gains strength most rapidly during the first few days and weeks.
新拌混凝土在开始几天和几周时间内强度增长很快。
When planning a concrete creation, the first thing to look at is the concrete surface.
当规划一个具体的建立，首先要考虑的是混凝土表面。
We should first sink in the steel wire before the concrete sets.
在混凝土凝土凝固前必须先插上钢筋。
First of all, concrete three-phase micro-mechanics model is built .
首先在考虑界面过渡区的情况下建立混凝土三相细观力学模型；
Now, for the first time, we think we have concrete information connecting the dots.
现在，第一次，我们认为我们有具体的信息连接点。
The first and second floors rest on a concrete base construction.
二层和三层坐落在混凝土基座结构上。
At first, they tried to use concrete to seal it up.
起初，他们试图用混凝土将漏洞封住。
First, we should see if it's real and if it is concrete.
首先我得看看这是不是真的。
First, we should see if it's real and if it is concrete.
首先我得看看这是不是真的。
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