untiring [ʌnˈtaɪrɪŋ]

例句:

• We must never be unworthy of our teachers'untiring and sincere teachings.
  我们决不要辜负老师的谆谆教导.
  
• None of the competitors could catch up with the untiring runner who was in the lead.
  没有一个参赛者能追上那个不知疲倦的领跑者.
  
• So , with great perseverance and untiring industry, he prospered.
  因此, 他靠了自己的坚毅顽强和不懈努力发达起来了.
  
• Ida was an untiring and conscientious worker.
  来自T. Collins