苦心

Every aspect of the original has been closely studied and painstakingly reconstructed.

原作的每一细节了仔细研究，费尽苦心才得重现。

The boy puzzled his way through geometry.

那男孩煞费苦心地钻研几何学。

The book was the result of ten years’ assiduous research.

那本书是十苦心钻研的成果。

The capitalist tried to hammer out an agreement with workers on overtime pay.

资方煞费苦心设法和工人达成了一项加班工资的协议。