the worth of a thing is best known by the want of it
一件东西的价值，在缺乏时才最清楚
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The worth of a thing is best known by the want of it.
东西的价值只有在缺乏时体会最深。（物以稀为贵。）
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