Still missing , it is claimed , were the drainage grooves that siphon off rainwater .

但是据称，重开之后这个跑道仍然缺少在雨天分流雨水的排水槽。

In french the word rifler meant to " scratch " and that 's why the grooves inside a gun barrel are called rifling .

在法语中单词rifler意为“刻画”，这是枪管里的导槽被称之为rifling的起源。

Use a soft brush to work it into the grooves of the plastic as well as for scrubbing seat pads and umbrella fabric .

用一个软刷子清洗塑料槽，就像擦拭坐垫和布扇一样干净。

The marine stratus clouds above were photographed by the aqua satellite over the south atlantic ocean , off the west coast of africa . A fractal cloud pattern is interrupted by a series of diagonal grooves .

上图中的海洋层云（stratusclouds）图是水文气象卫星（aquasatellite）在远离非洲海岸的大西洋上所拍摄的照片，图中分形状的云彩图案被一系列的对角线槽所扰乱。

In fact , the fangs of most toxic serpents have external grooves that direct the flow of poison . And the venom 's viscosity is key to getting it where it needs to go . So says a study in the journal physical review letters .

实际上，很多剧毒蛇的毒牙外部有毒液的导流槽，而毒液流至何方是由毒液的粘性决定的《物理评论快报》中的一篇论文如是说。