不能利用的

As well known, the loss of efficiency in est-imation and inference may be substantial if hetero-scedasticity is neglected.

熟知，如果误差同方差的要求能满足，用同方差回归模型的估计和推断的有效性会大大。

Since man is able to tap such resources as oil and metals, why can't he develop and harness other energy resources?

然人类能用石油和金属这样的能源,为什么能开发和用其他能源呢?

Not only major gene’s effect on fertility but also minor gene’s effect should be considered when utilize WCG to overcome semisterile between subspecies.

在用广亲和基因克服亚种间的半育性要考虑主基因对育性的作用，也能忽视多基因对育性的影响。

Some controversal points, like the absolute value of entropy and the proof of the unattainability of absolute zero by means of Carnot cycle, are discussed.

本文还讨论了一般所争论的问题,如熵的绝对值问题,用卡诺循环证明绝对零度能达到问题。