名词
中文翻译：关键
同义词：
['pivot', 'keystone', 'switch']
例句：
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1.The key to solving this problem lies in understanding the underlying cause.
解决这个问题的关键在于理解其根本原因。
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2. The keystone of the ecosystem is the balance between different species.
生态系统的关键石是不同物种之间的平衡。
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3.The switch was flipped, and suddenly the lights went out.
开关被翻转了，突然灯就灭了。