How all-female species avoid the shrinkage of their gene pool is among the animal kingdom's great mysteries.
一些物种只有雌性存在，可为什么它们的基因库不会缩小呢？这是动物界的一个很大的谜题。
Comparatively, with the reducing of shrinkage ratio of slit, the shock loads of receiving pool reduce, but the critical hydraulic head that just can cause deflecting heightens simultaneously.
相对而言，随着窄缝收缩比的减小，水垫塘冲击荷载略有减小，但同时起挑水头增加。
The author analyses some problems in pool design, such as the determine of groundwater level, the setting of shrinkage joint, practice of later casting zone and the fitting of design and construction.
通过作者多年在水池设计中所遇到一些常见问题，从结构专业的角度出发，分析探讨了地下水位的确定、伸缩缝的设置、后浇带的做法及设计与施工配合等问题。
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