来源:http://kids.yam.com/why/article/article527.html小朋友一定都知道海水是咸的,而且还知道它是因为含有盐分才会变咸,但是,这些海水里的盐,又是从哪 ...
Tuesday, April 6, 2010
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来源:http://kids.yam.com/why/article/article527.html小朋友一定都知道海水是咸的,而且还知道它是因为含有盐分才会变咸,但是,这些海水里的盐,又是从哪 ...
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