名词短语
中文翻译：独立秒表
同义词：
['self-contained timepiece', 'independent timepiece']
例句：
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1. The watch was designed to be independent and not rely on a central power source.
这款手表设计为独立运行，不依赖中央电源。
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2. She bought an independent second hand watch for her birthday gift to her father.
她买了一个二手的独立计时器作为送给父亲的生日礼物。
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3.The independent second hand watch is highly accurate and reliable.
这个独立的第二手计时器非常准确可靠。