relentless

adj.

不懈的；坚韧的，不屈不挠的；不间断的；未减轻的

1. He was relentless in demanding repayment of the debt.
   他冷酷无情地要求偿还那笔债。
2. However, in Antarctica, the elements are relentless.
   然而，在南极洲，自然环境是冷酷无情的。
3. I'm relentless in the pursuit of my goals.
   我持续不断地追求我的目标。
4. The traffic noise is relentless.
   车辆的噪音一刻也不停止。
5. This is reality, relentless and it will never cater to human willings.
   现实就是现实,永不停歇,也不以人的意识为转移。
6. Life is never just being. It is a becoming, a relentless flowing on.
   生命从来不止是生存。生命是成就自我，是一种不懈的追求。

The relentless rise of resistance?
Questioning the relentless shift to offshore manufacturing
Relentless pulmonary vein stenosis after repair of total anomalous pulmonary venous drainage.
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Relentless placoid chorioretinitis: A new entity or an unusual variant of serpiginous chorioretinitis?
Serrated polyposis: rapid and relentless development of colorectal neoplasia
Annotation: Tourette syndrome: a relentless drumbeat--driven by misguided brain oscillations
Transfusion-associated infections: 50 years of relentless challenges and remarkable progress
What Matters Now: How to Win in a World of Relentless Change, Ferocious Competition, and Unstoppable Innovation
Autoimmune-associated congenital heart block: dissecting the cascade from immunologic insult to relentless fibrosis