名词
中文翻译：闭槽
同义词：
['closed channel', 'closed passage']
例句：
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1.The machine has a closed groove for the bolts to pass through.
这台机器有一个闭槽，螺栓可以通过。
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2.The car's engine has a closed groove for the spark plugs.
汽车的引擎有一个闭槽，火花塞可以插入。
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3.The groove in the wall is too narrow for me to fit my hands through.
墙上的槽太窄了，我无法把手伸进去。