The separately mounted ring and gear are designed to function without any setup or adjustments.
分别安装在环与齿轮的设计为不需要任何设置或调整。
If you could just find one setup ring a bell, that would be good enough.
如果你能找到一个安装门铃，那将是足够的。
If you could just find one setup ring a bell, that would be good enough.
如果你能找到一个安装门铃，那将是足够的。
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