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obligation造句「obesity造句」
to+feel+an+obligation+toward造句？ It is indispensable for teachers to feel an obligation toward teenag...
obligation造句「observation造句」
英语中单词need的用法 n.需要, 必需 缺乏; 穷困; 困难; 危急 [常用复]需要的东西be in need of food需要食物daily needs日用品 =There is no nee...