多年积累的深层次问题 long-standing and deep-seated prolems ; long-standing and deep-seated
累积的问题 Accumulation of problems
这给大自然施加了无法承受的负担，致使积累的问题变得愈加难以解决。
It places impossible burdens on nature and leads to accumulating problems which become more difficult to sort out.
在过去的几十年里面，我们积累的问题绝对不仅仅是失败的结果。
The problems that have developed over the past decades are not simply the products of failures.
对在建模过程中积累的问题与经验作了探讨，提出了自己的一些见解和建议。
Questions and experience had been discussed that accumulated in the during of modeling, furthermore, some my own suggestion had been put forward.
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