The problem is so complicated that it will take us much time to work it out.
这道题这么复杂，我们要用很多时间才能解决。
This product is too complicated. Between the board of PMMA and the board of both sides, it will have the problem of not level, so, we can't make it.
这个产品结构太复杂。亚克力板与两侧木板之间的结缝处很容易产生不水平的情况。所以对于这款产品我们目前不能生产。请谅解。
The thermal crack problem of the mass concrete is very complicated, and correlative with structure, building material, construction, rock, circumstance, and so on.
大体积混凝土温度裂缝问题十分复杂，涉及到结构、建筑材料、施工、岩土、环境等多方面因素。
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