这引出了一个令人不安的问题：这些重新任职的大部分行政总裁实际上真正离职了吗？

This raises a troubling question: did most of these returning executives ever really leave?

youdao

我们不禁要问我们自己一个令人不安的问题：会不会出现一天，到时候辽阔的海洋中一条鱼也找不到了？

We can't help asking ourselves a disturbing question: will there be a day when no fish can be found in the vast oceans?

youdao

最后，这项实验提出了这样一种可能性，即这种神经元可以用于目前使用胎儿脑细胞的实验治疗，避开了一个令人不安的伦理问题。

Finally, the experiment presents the possibility that such neurons could be used in experimental treatments that currently use fetal brain cells, sidestepping an uncomfortable ethical issue.

youdao