The main disadvantage of concrete is poor tensile strength and easy to crack.
混凝土最主要的缺点是抗拉能力差，容易开裂。
This means that the airtight of the raw concrete material is poor.
这说明单用混凝土材料建池密封效果差。
However, there are many shortcomings of concrete; the key point is that poor cracking resistance.
但是，混凝土也有许多缺点，关键的一点就是抗裂性能差。
However, there are many shortcomings of concrete; the key point is that poor cracking resistance.
但是，混凝土也有许多缺点，关键的一点就是抗裂性能差。
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