Only metals which exist as free elements can be extracted by physical methods. These metals include gold and silver.
只有以自由态的形式存在于地壳中的金属才可以用物理方法来提取，这些金属包括金和银。
Only metals which exist as free elements can be extracted by physical methods. These metals include gold and silver.
只有以自由态的形式存在于地壳中的金属才可以用物理方法来提取，这些金属包括金和银。
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