99stem from sth-to be caused originally by sth-起源于;来自;由
the area being studied i.to find sth. existing but not known
辨析used-to-be-used-to-do-sth-be-used-to-doing-sth
说服某人 persuade sb 说服某人做某事 persuade sb to do sth
d228地道表达knowsthbacktofront78
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