all前面用a还是an

al盟敢势袂l前面用an。

all前面用an,一般发音是元音字母的话，用an。

But it wasn't all an act, was it?

但不全是演戏，对吧？

Just kind of figured he'd give us all an oral history in alien-interrogation techniques.

我原以为，他会给我们讲讲外星人是如何审问他的。

and it's all an experiment, and it's all voluntary.

这一切都只是个实验，都是自愿的。

Everything negative--pressure, challenges--is all an opportunity for me to rise.

压力、挑战，这一切消极的东西都是我进步的机会。

All an observer can do on the ground is say, this is what we've seen.

在现场的观察员所做的事情只有说明他们所看到的事情。