It is a very complicated problem that is not only related to the shock wave interaction, but also to the shape, size and natural frequency of the ventilation structure.

它不仅与冲击波的作用情况有关，而且与通风构筑物的形状、大小、自振周期等因素有关。

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The author considers that outburst of coal-seam gases is not only a dynamic phenomenon, but also a very complicated thermodynamical conversion process of energy.

作者认为，煤层气体的突出不仅是一种动力现象，它还是一种复杂的热力学过程。

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For the calculation of the crane box-style beam, which is generally very complicated, not only waste much time but also very easily make mistakes.

对于起重机箱形梁的计算一般比较复杂，用人工计算不仅耗时比较长，而且很容易出现错误。

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Dr. HAYES: Well, it's very complicated, why the - and I appreciate my colleague also chiming in, but some of it is they have been exposed to often - and had the leisure time try to pursue healthier pursuits.

NPR: Confronting Misconceptions About Cancer Prevention