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A solid has both definite size and shape.
固体既有一定的大小，又有一定的形状。
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A gas has neither definite size nor definite shape.
气体既没有一定的体积，也没有一定的形状。
In one word, a gas has neither definite size nor shape.
总之，气体既没有一定大小，又没有一定形状。
The compact size and weight are definite benefits when you are traveling, find yourself confined to a small working environment, or need access to large documents or manuals.
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