There are only two alternatives: either you experience it directly, or you know nothing about it.

只能存在两种情况：要么你直接体验它，要么对它一无所知。

youdao

If you need speed, there may be only one or two ways to achieve the fastest results, whereas there are many slower alternatives.

如果您需要很快的速度，不管有多少种慢速的方法，但是可能只有一两种方法可以达到最快的结果。

youdao

The decision is remarkably reliable, with the bees choosing the best site even when there are only small differences between two alternatives.

这一通过蜜蜂自己选择最佳地点的决策过程非常可靠，即便是在两个可选项目差别很小的情况下。

youdao

Eventually, I think such a commission would come to the conclusion that there are really only two alternatives.

FORBES: We Are Happily Beyond The Days Of Ron Paul's Lonely Crusades

Major Strasser: There are only two other alternatives for him.

NPR: Historian Robert Satloff