最后，三年级至四年级期间，就业压力和长期学习的疲倦感导致流利性发展缓慢。

Finally, from Grade Three to Grade Four, fluency develops very slowly because of job hunting pressure and tiredness from long-term study.

youdao

对于这些文艺复兴巨匠们来说，掌握每一项工艺都意味着要学习相关的基本原理并且不知疲倦的运用它们，最终将这项工艺扩展并加以提高。

For these Renaissance giants, mastering each craft meant learning its fundamental principles and then tirelessly applying them — and eventually expanding and improving upon them.

youdao

它几乎已经成了帕特里克的小累赘，帕特里克不得不比以前任何时候都努力地学习，每天都坚持到深夜，他从未感到如此疲倦，每次都肿着双眼，神志不清地赶着去上学。

He was staying up nights, had never felt so weary, was going to school with his eyes puffed and bleary.

youdao