On these trips he would have a vague plan A, a goal in view, for he had learned to appreciate planning during a wartime spell in the navy; but plans B and C might be good, too.

因为在海军服役的一段战争时期，他学会了重视列计划，所以在这些旅途中他往往会构思出一个模糊的目标“计划A”，此外还有也许是更好的“计划B”和 “计划C”。

youdao

We have also learned that the direction of the cross product is given by taking the direction that's perpendicular to a and b.

我们还学过，外积的方向，与A和B均垂直。

youdao

A gifted artist in his early 60s, the patient was a liver transplant candidate who learned he had hepatitis B some 20 years earlier.

这位病人是位60出头的杰出艺术家，他20年前就患有病毒型肝炎，曾是肝脏移植候选者。

youdao

Mel B and Geri Halliwell have already learned that life alone in the pop world is tough.

BBC: Emma Bunton

It should have learned that lesson from the Susan B.

FORBES: NO PEEPING WITHOUT PERMISSION

"Japan was my B-school, " says Chaudhary, who learned Japanese to be able to negotiate better and order vegetarian food.

FORBES: Magazine Article