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Monophthongs and diphthongs are two major types of vowels. ()

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The early settlers in the colony discovered a way to make money by growing tobacco. ()

简述焊接区域中氢的来源及其主要危害?

Priestley thinks he will become more famous if people know what is in his mind when he

Philosophy, psychology, and anthropology are all concerned with the study of meaning.

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