因为不知道如何解这道物理难题，他求助老师。
Not knowing how to work out the difficult physics problem, he asked the teacher for help.
因为不知道如何解这道物理难题，他求助老师。
Because he didn't know how to work out the difficult physics problem, he asked... help.
因为不知道如何解这道物理难题，他求助老师。
Because he didn't know how to work out the difficult physics problem, he asked... help.
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