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他
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他
(third-person singular) (since the early 20th century, usu. male) he; him; his; (bound form) other; another; some other (as in 他日 (tārì) and 他人 (tārén))
不
no; not so; (bound form) not; un-
在
to exist; to be alive; (of sb or sth) to be (located) at; (used before a verb to indicate an action in progress)
办公室
office; business premises