heated.water.changes.into.steam这一结构的逻辑主语是主句的主语,这句话是何意,逻辑主语是heated吗...

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heated.water.changes.into.steam这一结构的逻辑主语是主句的主语,这句话是何意,逻辑主语是heated吗...
heated.water.changes.into.steam这一结构的逻辑主语是主句的主语,这句话是何意,逻辑主语是heated吗?请高手详细解答,谢谢各位啦~~

When heated,water changes into steam.= When water is heated,it changes into steam.水加热时,水会变成蒸汽.