Jee Young Choi(韩国人名)设计的有沟槽的牙刷提供了一个绝妙方法来将最后一点牙膏挤出。
Slotted toothbrush designed by Jee Young Choi provides a clever way of squeezing out that last drop of toothpaste.
与此类似的一幕场景也出现在带槽轮胎上，新的规则规定，所有的轮胎都必须在纵向有4条间隔50毫米深至少2.5毫米的连续沟槽。
This led to the familiar sight of 'grooved' tyres, the regulations specifying that all tyres had to have four continuous longitudinal grooves at least 2.5 mm deep and spaced 50mm apart.
有一种叫做沟槽的东西——一种用来阻止两面沟壁往下坍塌的金属容器——当你挖土超过5英尺(约1.52米)深时，用它来防止沟壁坍塌。
There's something called a trench box-a metal case that holds back the sides of the walls-used to stop the walls from 5 caving in when you dig deeper than 5ft.
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