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，如果误差同方差要求不能满足，用同方差回归模型估计有效会大大降低。

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

既然人类能用石油金属这样能源,为什么不能开发用其他能源呢?

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.

在用广亲基因克服亚种间半不时不仅要考虑主基因对作用，也不能忽视多基因对影响。

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问题,如熵绝对值问题,用卡诺循环证明绝对零度不能达到问题。