k开头的形容词形容物品

　　He is little known as an artist.

　　几乎没人知道他是个艺术家。

　　Christopher is commonly known as Kit.

　　克里斯托弗通常被称为基特。

　　I wish we'd known about it beforehand.

　　要是我们预先知道这事就好了。

　　Diamonds are the hardest known mineral.

　　钻石是已知的最坚硬的矿石。