金刚砂是非常坚硬的金属物质。
Beware of what you do with this dangerous substance.
你处理这些危险品时,可要当心。
Later he became a man of substance.
后来,他成为颇具资产的人。
There is not anything of real substance in their book.
他们的书中没有什么实质性的内容。
This argument has some substance.
这项争论具有一定的重要性。
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