山水平川
我只好回家了 I have no choice but go home或者I would have had to go home或者I have to go home!可能最后一种是比较常用的例如我吃了妈妈美味的面条后就出门了，但是天公不作美啊，不过一会就下雨了，我只好回家了！After I have eaten mother the delicacy noodles, has gone out, but the God does not cooperate, but one rains, I had to go home!
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