Pre - pressure need further study because it involves many factors.

预压力与很多因素有关，需作进一步探讨。

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Loading of trains is a complex issue. It involves many factors such as the axle weight, suspension system, traveling speed, track structure, geometric irregularity of lines and so on.

列车荷载是一个很复杂的问题，同时涉及列车轴重、悬挂体系、行车速度、轨道组成、线路平顺等等因素。

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The final rules reduced that requirement to 5%, but many physician organizations say the requirement is unfair, because meeting it involves factors outside of their control.

FORBES: Is there a business case for engaging patients?