painstakingly GMAT

He’s always painstakingly at his books.

他总是在埋头苦读。

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

原作的每一细过了仔细研究，费尽苦才得以重现。

The old painting was damaged in the flood and had to be painstakingly restored.

那幅古画在洪水中遭到毁坏, 必须精修复。