painstaking

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The modern history has witnessed the pains-taking efforts made by China and the United States to develop their friendly relationships.
现代历史见证了中国和美国为了发展两国友好关系所做出的艰苦努力。
We teachers find it hard to really understand the difficulty and pains-taking efforts on the part of- the students in writing until we admit this process.
我们教师只有承认了这一事实，才能真正了解高中学生写作的难处与苦衷，才能有针对性地对学生进行写作教学活动。
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Ifcold and wet have nothing to do with colds, then why are they more frequent in the winter?Despite the most pains-taking research, the answer has not yet been found.
那么，既然寒冷与潮湿与患感冒并无关系，为什么人们在冬天更容易感冒呢? 虽然尽了最大努力进行研究，但至今还没有人找到答案。
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Milton's taking pains here, and he does this with very few other poems, to let us know precisely when it is that he's written it.
弥尔顿在这里极力想让我们，知道他确切的创作时间。
耶鲁公开课 - 弥尔顿课程节选

Administration officials have not been fans of Hersh's past articles, taking pains at times to denounce them.
NPR: Advocate of Conflict or Cease-Fire?
Dixon is at least taking pains to assert that the sun is rising on a new era of responsible spending at Chesapeake.
FORBES: No April Fooling - McClendon Finally Gone From Chesapeake Energy
While Polaris is taking pains to keep the two brands separate, its experience building Victory has taught it a lot about motorcycle buyers, said Menneto.
FORBES: Polaris Rides ATV And Snowmobile Success In Bid To Revive Indian Motorcycles

A painstaking search, examination, or investigation is done extremely carefully and thoroughly.
painstakingly