工程进度容易受到各种客观和人为因素的制约，而偏离计划。
The project progress is apt to receive the restriction of various kinds of objective and human factors, and deviate from the plan.
黄土暗穴的稳定性不仅与黄土自身的工程地质特性有关，而且还与各种自然条件及人为因素有关。
The stability of loess hidden holes not only relates to the engineering geology characteristics, but to all kinds of natural conditions and human factors.
字段也被称为人体工程学，以及人为因素。
The field is also called human engineering, and human factors.
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