which contains two elements
The reason is "comparative advantage", this phrase in itself implies a profound theoretical core, which contains two elements: First, "more" to compare all the difference, and is unique, it is two or two The object of the above in a comparison of levels.
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which contains two elements
它包含两个元素
以上为机器翻译结果，长、整句建议使用 人工翻译 。