painstakingly

painstakingly

释义：“煞费苦心的”，这一副词常在留学文书中修饰学生在课堂内外努力进行的尝试。

例句：
A number of marine animals were spared by painstakingly cleaning them and later returning to their native waters.
Paris Opera performers have been painstakingly trained to dance this way for decades.