名词
中文翻译：环形凹槽
同义词：
['annular space', "annular gap例句：1. The machine has a large annular recess for holding tools.（这台机器有一个大型的环状凹槽用于放置工具。）2. The car's engine compartment had a small annular recess for storing spare parts.（汽车的发动机舱有一个小的环状凹槽用于存放备件。）"]
例句：
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1. The machine has a large annular recess for holding tools.
这台机器有一个大型的环状凹槽用于放置工具。
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2. The car's engine compartment had a small annular recess for storing spare parts.
汽车的发动机舱有一个小的环状凹槽用于存放备件。
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3. The scientist found an annular recess in the rock that could hold water.
科学家在岩石中发现了一个环状凹槽，可以储存水。