这些门用纯钢制作，里面用混凝土填充。这两扇门重达20吨。

These gates are made from pure steel, and the inside part is filled with the concrete. The weight of the gates is 20 tons.

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他的第一部小说《三重门》写出青春期少年在家庭与学校的压力下枯萎的故事。

His first novel, "Triple Door," plumbed the adolescent angst of those withering under the pressures of family and school.

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现在，有一门新技术被用来帮助用户重夺他们的注意力，并且更易懂更集中。

Now a new class of technologies is being designed to help users to regain their focus and enjoy more lucidity and concentration.

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