There are some diffcult physics problems 改为单数句
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Therearesomediffcultphysicsproblems改为单数句Therearesomediffcultphysicsproblems改为单数句Therearesomediffcult
There are some diffcult physics problems 改为单数句
There are some diffcult physics problems 改为单数句
There are some diffcult physics problems 改为单数句
There is a diffcult physics problem.
There is a difficult physics problem.
There is a diffcult physics problem。