In conventional railroad building methods, a load of crushed rock is laid after the footing has been prepared. The crushed rock is called ballast, and it severs both to distribute the load and to provide drainage .

在传统的铁路施工中,基础平整完毕以后再铺上碎石子。这种碎石子叫做道碴,用来分散负荷和排水。

属类：工程技术-交通-交通土建工程

In some places in the State of Ohio, where floods or loss of soil or road construction complicated the problem these drainage districts evolved by 1920 into“Conservation districts”where the farmers worked cooperatively on their common problems

在俄亥俄州某些地方,因为洪水泛滥,或土壤流失,或受道路建筑的影响,致使问题变得很复杂,或土壤流失,或受道路建建筑的影响,致使问题变得很复杂,到了1920年,在这样的地方,这些“排水区”就变成了“土地保养区”,这些地区的农民同舟共济,共同解决问题。

属类：综合句库--

During the Pleistocene Ice Age, the ancient drainage systems were almost completely rearranged by glaciation

在更新世冰期,古水系常被冰川作用完全改造。

属类：综合句库--

Flat roofs have historically been used in arid climates where drainage of water off the roof is not important, as in the Middle East and the southwestern U.S.

在历史上,平屋顶多被用在较干旱的地方,因为在这些地方,屋顶的排水并不重要,如在中东和美国西南部。

属类：工程技术-建筑-

In drainage of agricultural lands, a filter or gravel envelope is used to prevent the entrance of fine sand and silt into the drains

在农田排水中常常采用砾石或过滤层来防止粉细砂和泥沙进入排水沟。

属类：综合句库--

Chest percussion and vibration are used with postural drainage to help dislodge secretions

在做体位引流时要敲击和振动胸部帮助分泌物松动排出。

属类：综合句库--

This effect is because the iris, crawled back into the angle of the anterior chamber of the eye, interferes with drainage of aqueous humor

这是因为虹膜退缩在眼前房内,妨碍了房水的引流。

属类：综合句库--

These textile materials act as a barrier to the movement of soil particles but permit the flow of water necessary for adequate drainage .

这些纺织材料相当于一道屏障,它阻止了土壤颗粒的运动,但允许水的流动,以利于排水。

属类：行业术语-纺织服装-

The city was even equipped with a drainage system, for a great many clay pipes were found beneath the narrow streets.

这座城市甚至还敷设过排水系统,因为在窄窄的街道底下发现了许多陶土制的管道。

属类：综合句库--

Drainage was to the north and individual channels bifurcate in that direction

整个水系向北排水,各个河道朝该方向分叉。

属类：综合句库--