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一种坚固的钢，轧成一定形状用于建筑。
A strong steel that is rolled into shapes that are used in construction.
youdao
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总之，气体既没有一定大小，又没有一定形状。
In one word, a gas has neither definite size nor shape.
youdao
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总之，气体既没有一定大小，又没有一定形状。
In one word, a gas has neither definite size nor shape.
youdao