苦心

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

那本书是十年苦的成果。

The boy puzzled his way through geometry.

那男孩煞费苦地几何学。

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

资方煞费苦设法和工人达成了一项班工资的协议。

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

原作的每一细节都经过了仔细究，费尽苦才得重现。