英语翻译1.没人知道这起交通事故是怎么发生的 2.他把自己打扮成一个农民以至于没人可以认出他(dress oneself

好吧,我来翻一下.
1.Nobody knows how this car accident happened.
2.He dressed himself as a farmer so that nobody recognised him.
3.Once you have made a promise,you should keep to it.推断你把你打成了米,已自动更正.
4.He held his breath to find out where the sound came from.
希望我的答案还能满足你的要求.