名词
中文翻译：线膨胀
同义词：
['line contraction', 'line shortening']
例句：
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1. The steel bar expands as it is heated.
当钢棒加热时，它会变长。
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2. During the expansion, the volume of the gas increases.
在膨胀过程中，气体的体积会增加。
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3. Line expansion is a factor that affects the performance of materials.
线膨胀是一个影响材料性能的因素。