The physics problem is too hard, so few students can work it out.
这道物理题太难了，很少有学生能做出来。
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。
The physics problem is difficult to work out.
物理问题是难以奏效的。
The physics problem is difficult to work out.
物理问题是难以奏效的。
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