Anger can be good for the soul, because if we didn"t have challenges we would never change."

生气也有好处，因为如果没有挑战就没有改变。

youdao

"No,we can't start over because if we start over life will be over for too many Americans."

VOA: standard.2010.03.10

but it's not invisible if we mean definition No. 2 can't be sensed. Can't be observed.

但如果取第二个定义它就不再无形2,无法感知，不能观察。

耶鲁公开课 - 死亡课程节选

So it turns out that we can, in fact, use the energy levels to predict, and we could if we wanted to do them for all of the different wavelengths of light that we observed, and also all the different wavelengths of light that can be detected, even if we can't observe them.

事实上我们可以用能级预测,而且如果我们想的话，我们可以,对所有观测到的光的波长预测，也可以对所有探测到的光预测,即使我们看不到它们。

麻省理工公开课 - 化学原理课程节选

If we can't get this done for 2010, we will be in serious difficulty.

BBC: Mosley wants action to 'save' F1

"If we can't solve even Greece, we won't be seen as being able to solve anything else, " he said.

WSJ: European Disunion: Dithering at the Top Turned EU Crisis to Global Threat

If we can't be successful here, we won't be successful in the global war on terrorism.

CENTERFORSECURITYPOLICY: What are we fighting for?