human forces

Needs are the basic, often instinctive, human forces that motivate a person to do something.

各种需要是人类基本的, 通常又是出于本能的驱动力, 这种驱动力促使一个人去从事某件事情.

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Aspect of the first kind is the most effective to evaluate thin reservoir exactly by principle, but a large number of human forces, finance and time is cost and existing datum is not used sufficiently.

从原理上讲，要正确评价薄油层从第一方面入手是最有效的，但要花费大量的人力、物力及时间，而且无法充分利用现有资料。

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