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。
It is important for drainage work since checks can be made on its effectiveness before planting . 排水工作很重要，因为在栽植前就可对其效果加以控制。
It became necessary to provide drainage or sewer systems to carry such wastes away from the area . 提供排水系统或污水管道系统，把废物排出市区已成为必要。
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。
The rainy season is coming. it 's a matter of great urgency to repair the drainage and irrigation equipment . 雨季就要到了，修理排灌设备是急如星火的任务。
A scientist measured rainfall and discharge in the seine drainage basin for a period of three years . 有一个科学家测量了塞纳河流域盆地三年内的降雨量和流量。
I discovered that a lot of imported drainage pipes for the settlement had been tumbled in there . 我看见大量的从外地运来供居民点使用的排水管道，横七竖八的扔在那里。
Small alluvial fans at mouths of wet weather drainage ways also are commonly intermixed indistinguishably . 潮湿气侯地区河道出口处的小冲积扇，其沉积物的混合通常也难以区别。
Improvements in drainage and fertility levels are in themselves methods of reducing the incidence of some of these weeds . 改进排水和肥力水平本身就是减少某些杂草生长的方法。
On either side a checker of open ditches showed where the municipal constructors had designed a system of drainage . 马路两旁纵横交错的阴沟说明承包市政工程的商人曾计划在那里修建排水系统。
