sb who has come back to China after gaining overseas experience (a pun on 海龜|海龟[hai3 gui1]) / to return to China after a period of study or work overseas
to return / to go back to / to give back to / (of a responsibility) to be taken care of by / to belong to / to gather together / (used between two identical verbs) despite / to marry (of a woman) (old) / division on the abacus with a one-digit divisor