On the fly居然不是“在飞机上”？那是在哪里？
She's got off to a flying start in her new job. 她在新工作中有了一个良好的开端。
He got off to a flying start in the race. 他在比赛一开始就表现出色。
I don't have enough time to prepare, so I guess I’ll just have to do in on the fly.
我没有足够的时间准备，我想我只能匆匆忙忙地做了。
You know, his speeches are much better when he does them on the fly. 你知道，如果他好好准备的话，他的演讲会更好。
He’s extremely irritable, and he flies off the handle at the slightest thing.
他非常暴躁，一点小事就发火。
He flew into a rage when I told him you were not giving his money back. 当我告诉他你不还他的钱时，他勃然大怒。
Fly in the face of sth
This is an argument that seems to fly in the face of common sense.
这似乎是一个违背常识的观点。
It flies in the face of everything I have been taught.
它与我所学的一切背道而驰。
You can’t trust that company, because they’re a fly-by-night operation.
你不能相信那家公司，因为他们是一个不可靠的公司。
I bought this watch from a fly-by-night shop, and it broke within three weeks.
我从一家不靠谱的店买了这块手表，不到三周就坏了。
Fly on the wall
You would like to hear what will be said or see what will happen while not being noticed.
I’d like to be a fly on the wall for that conversation. 为了那场谈话，我愿意变成隐形人。
I’d love to be a fly on the wall when those two get home!
当他们两个人回家时，我真想变成隐形人。
You can suggest a change to the company policy… but I’m warning you, it’ll never fly. 你可以建议改变公司的政策……但我警告你，这是不可能的。 Trying to sneak out early from class will never fly. 想早点从班里溜出去是绝对不行的。
Sparks fly every time she has to interact with her ex-husband.
每次她要和前夫互动的时候都会火花四射。
I could see the sparks fly between them, the first time they met.
他们第一次见面时，我可以看到他们之间花火四射。