I meet a problem difficult to solve.
我遇到一个难以解决的问题。
It is a problem difficult to solve.
这是一个难解决的问题。
It is a problem difficult to work out.
这是一个难以解决的问题。
It is a problem difficult to work out.
这是一道难以解决的问题。
Power network planning is a NP hard problem difficult to be solved.
电网规划是一个较难解决的NP难问题。
Power network planning is a NP hard problem difficult to be solved.
电网规划是一个较难解决的NP难问题。
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