indefatigable

这位老师孜孜不倦地帮助学生们准备考试。

The teacher was ___indefatigable in helping students prepare for the exams.

这位不知疲倦的护士在下班很久之后依然在照顾病人。

The ___indefatigable nurse continued tending to patients long after her shift had officially ended.

他对真相坚持不懈的追寻最终揭露了别人忽视的腐败。

His ___indefatigable pursuit of the truth eventually uncovered the corruption that others had overlooked.