Finally, after painstaking research through old books of Wizarding families, he discovered the existence of Slytherin's surviving line.

经过在旧书和巫师家庭中一番艰苦的查询，他终于发现了斯莱特林家族残存的一支。

youdao

He has finally cracked the system after years of painstaking research.

经过数年的艰苦研究，他最终破译了该系统。

《柯林斯英汉双解大词典》

After much painstaking 'research', the secret to the perfect pint may finally have been discovered.

经过许多费力的“研究”，完美啤酒的秘密最终被发现了。

youdao

After years of painstaking research, there is substantial documentation relating to the systematic killing of a large proportion of the some 1.7 million Cambodians who died during the 1975-79 reign of terror.

CNN: SELECTIVE MEMORIES

For example, it was only after many years of painstaking research that the routine use of oxygen to resuscitate babies at birth was found to be harmful.

BBC: Children 'missing out on research benefits'