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1·Watch out! You almost fell into the drainage hole.

小心！你差点掉到下水道里去了。

2·Simply use a piece of screen wire to cover the drainage hole.

简单地用网线（纱窗，防虫网）盖住排水孔就够了。

3·Study on numerical simulation of drainage hole of seepage field in underground engineering with implicit composite element method;

基于变分原理，研究渗流分析中模拟排水孔和不连续面的复合单元法。

4·According to seepage theory, the gas seepage from drainage hole along coal seam is studied by means of electrical simulation experiment.

根据渗流理论，本文对沿层抽放钻孔周围的瓦斯渗流问题进行了电模拟实验研究。

5·In this paper, we deduced the formula for the length calculation of drainage hole in which the water could not be frozen through perennial soil.

推导出通过多年冻土段不发生冻结泄水洞长度的计算公式。

6·Then using the superposition principle of well group, the analytic theory of single drainage hole is spread to multiple drainage holes in the element.

然后，应用井群的叠加原理，将单个排水孔的解析理论推广到单元内多个排水孔的情况。

7·The drainage hole is an important seepage control measure, so it is one of the key problems to simulate the effect of the drainage hole in the seepage analysis.

排水孔是重要的渗控措施，如何准确模拟排水孔的作用是渗流分析中的关键问题之一。

8·The tube body and the tube bottom of the round tube are fixed together, the tube body adopts a cylinder, and a water drainage hole is arranged at the tube bottom.

圆桶的桶体和桶底固定在一起，桶体形状为圆柱体，桶底上开 有透水孔。

9·A novel grass planting brick mainly comprises an upper brick surface, a bearing surface on the bottom part, an earth storage surface on the waist part, a grass planting hole and drainage holes.

一种新型植草砖，它主要包括上砖面、底部承重面、腰部储土面、植草孔、排水孔。

10·The use of pre buried in the structural layer of the drainage pipe hole as a deformation of the default seam to prevent the development of cracks.

行使预埋在结构层中的排水管孔作为变形预设缝，防止裂缝开展。