尽管我尽了力，但还是不能解决那个复杂的问题。（译成让步分句）

Try as I might, I still could not solve the complicated problem.

youdao

尽管我尽了力，但还是不能解决那个复杂的问题。（译成让步分句）

Try as I might, I still could not solve the complicated problem.

youdao