It is impossible to learn the sequence of events that led to our developing the concept of number.

我们无法了解导致我们产生数字概念的事件的发生顺序。

youdao

Even if stressful events are dangerous, many—like the death of a loved one—are impossible to avoid.

即使有压力的事很危险，比如所爱之人的死亡，但这些事很多是无法避免的。

youdao

In some cases they may be corrected to resume the normal flow of events, in others they will make it impossible to meet the goal.

在某些情况下，他们可以被纠正以重新开始正常的事件流，在其他情况下，他们则达不到目标。

youdao

To be sure you are marking a fundamental change in human society borders on the impossible--such events happen just a few times a century, and (barring things like ecological collapse) rarely with anyone's ability to see at the time that anything has changed.

FORBES