稀土是储量较少的一类金属的统称。
Rare earth, an nonrenewable resource, is a general name for 17 low-reserve metallic elements.
平庸的教育理论是我们对当前教育理论研究中存在的一类教育理论的统称，无思想是平庸教育理论的本质特征。
Mediocre educational theory refers to a category of current educational theory, without thought is the most essential characteristic of mediocre educational theory.
平庸的教育理论是我们对当前教育理论研究中存在的一类教育理论的统称，无思想是平庸教育理论的本质特征。
Mediocre educational theory is very harmful to education, which will not only make the theoretical research related mediocre, at the same time, will result in the educators' collective mediocrity.
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