有没有什么个人经历使您投身于数据加密之中呢？

Did you have a personal experience that led you to encryption?

youdao

但这里并没有什么个人的，没有问候，没有特别的建议，没有提及到作者过去。

But here there is nothing personal, no greeting, no special recommendation, no allusion to the author's past.

youdao

没有什么可以保证每个人都愿意付出努力；学生的辛苦学习是否能得到适当的回报，这是没有把握的。

There is nothing to guarantee that everybody is willing to make the effort; there is no assurance that the learner will have any adequate return for his toil.

youdao