名词
中文翻译：基础石
同义词：
['founding stone', 'cornerstone']
例句：
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1. Thefoundation stone of the new library is alarge marble statue.
新图书馆的基础石是一座巨大的大理石雕像。
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2. The cornerstone of theproject was laid on this day.
该项目的基石是在这一天铺设的。
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3. The founding fathers believed that the cornerstoneof democracy was freedom of speech.
开国元勋们认为民主的基石是言论自由。