plan on: 打算
How can we change our original plan on a sudden impluse?
一时心血来潮， 就改变了原计划，那怎么行呢？

whiz by: 呼啸而过
They eat crouched in corners or on the street as cars whiz by.
他们蹲在角落里或在轿车呼啸而过大街上吃饭。
Trees whiz by on the way to the okefenokee swamp, georgia, u.s.
在前往美国乔治亚州奥克弗诺基沼泽的路上，路边的树木呼啸而过。

have an affair: 有外遇
Then why did he have an affair?
那为什么他会有外遇？

figure out: 弄明白
Her mission was to figure out what where she could make an impact.
她的使命是找出自己能够施加影响的领域。

settle for: 勉强同意，接受
Virginia was a perfectionist. She was just not prepared to settle for anything mediocre...
弗吉尼娅是个完美主义者，她根本不愿意拿任何普普通通毫无特色的东西将就。
England will have to settle for third or fourth place.