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，尽苦心才得以。

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

幅古画在洪水中遭到毁坏, 必须精心修复。