B How long are you going for?

B你要去多久？

youdao

Good afternoon. How much? How long? How nice! How beautiful! A: Good morning. B: morning.

下午好！ 多少钱? 多久?（多长?） 多漂亮啊！ 多美啊！

youdao

The findings of Gravity Probe B are the latest in a long list of these many vindications of Einstein's genius and reveal how his great theory touches our lives in unexpected ways.

重力探测器B的发现不过是众多证据中最新的一项，来证明爱因斯坦的天才和揭示他那伟大的理论是如何以意想不到的方式来触及我们的生活的。

youdao

They are looking in particular at how long it takes a B-meson to change its nature, focusing on one particular member of the extended B-meson family, the electrically neutral B0.

ECONOMIST: The arrow of time

B-meson travelled before it broke down, and thus how long it lasted.

ECONOMIST: How to build a B-factory