Silk is a kind of smooth and soft material.
丝绸是一种光滑柔软的材料。

Aluminium is a kind of metal.

铝是一种金属。

N-UNCOUNT. 乡村摇滚乐（19世纪50年代出现于美国南部的快节奏摇滚乐）. Rockabilly is a kind of fast rock music which developed in the southern United States in the 1950s.

Aluminum is a kind of metal.

铝是一种金属。

Although bamboo is really a kind of grass.

尽管这样竹子的确是一种草。

※Ingratitude is a kind of weakness; clever men are not ungrateful. 忘恩负义是一种软弱的表现；明智的人不会忘记别人的恩德。
※Words and deeds are quite indifferent 23modes of the divine 24energy. Words are also action, and actions are a kind of words. Ralph Waldo Emerson, American thinker——语言和行动是人的非凡活力的两种普通的表现形式。语言也是行动，行动也是语言。   美国思想家 爱默生. R .W.
※Piterature is a kind of intellectual light which, like  the light of the sun , may  sometimes enable us to  see what we do not  like.Samuse Johnson, British writer and critic文学是一种理智之光，它和阳光一样，有时能使我们看到我们不喜欢的东西。英国作家、批评家  约翰逊 S

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