名词
中文翻译：Unknown
同义词：
['umbrella gear', 'umbrella pulley']
例句：
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1.The umbrella pulley is the part that allows the umbrella to open and close.
伞滑轮是允许雨伞打开和关闭的部分。
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2.The umbrella pulley is a crucial component of the umbrella mechanism.
伞滑轮是雨伞机制中的关键部件。
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3. The umbrella pulley was designed to be easy to adjust for different sizes of umbrellas.
伞滑轮设计为易于调整，以适应不同尺寸的雨伞。