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1·They used waterproof cement to prevent water from seeping through the roof of the runnel.

他们用防水水泥来防止水从 屋顶的 排水通道里渗透。

2·They used waterproof cement to prevent water from seeping through the roof of the runnel .

他们使用防雨水泥以防止雨水从屋顶的排水渠里渗透出来。

3·Before we came to southern Appalachia, we lived for years in Arizona, where a permanent runnel of that size would merit a nature preserve.

在来到阿帕拉契亚东部之前，我们一家在亚利桑那州呆了很多年，那里有一条和这条小溪差不多大小的永久性流河，在我看来应当将这条河划分为自然保护区。

4·The measurement and control system plays a vital role in the wind tunnel test. The management software is a key to the automatic measurement and control system of the wind runnel test.

测控系统是风洞试验系统的重要组成部分，测控管理软件是实现风洞试验自动化测控的关键。

5·I heard the runnel with delight; I looked round me for some-thing beautiful and unexpected; but the still black pine-trees, the hollow glade, the munching ass, remained unchanged in figure.

我听到了河水欢快的流淌，我环视四周，想寻找些意外的美丽，但是一动不动的黑松林，空阔的草地和嚼草的驴子，都毫无变化。