gas, 气体, solid, 固体, liquid, 液体, water vapour, 水蒸气, evaporation, 蒸发, condensation, 凝结, freezing, 凝固, melting, 熔化, boiling, 沸腾, heat, 加热, cool down, 降温, process, 过程, matter, 物质, material, 材料, form, 形成.

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