热胀冷缩（Heat expands，Cold contracts）金属热胀冷缩： Metal expands with heat and contracts with cold. 一般来说，固体热胀冷缩： As a general rule,solids expand as the temperature increases and contract when they are cooled热胀冷缩是所有物质的共性. It is a common property of any matter that is expanded when it is heated and it contracts when cooled.即：任何物质,如果遇到热,它就会膨胀,如果遇到冷,它就会收缩,这是共性热胀冷缩是一种自然形成的东西,热就膨胀,冷就缩小。热膨胀(Thermal Expansion)
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