No problem:).
I feel frustrated, 因為這種事情發生過很多次，不僅造成mistakes, 還造成同事之間關係變得扭曲，同事變得想要perform, 不想讓人覺得自己不行， 所以抓住事情就埋頭做，因此造成不少mistakes, 這次是比較大的。
--> Nothing wrong that coworkers want to perform and every boss wants to see it - you can get used to it and be more competitive. Next time, you will reply the email to everyone that you will take care of it if you believe you are the right person to handle it.
我不覺得我比他smarter，可是我不知道boss 有什麽原因不作為。
--> The resaons behind it could be various which could be totally out of your control and your boss doesn't have to explain everything to you. Your boss has his power to make it the way you wanted but he might have his concerns or his ways to handle things. Or, maybe, at least, he was happy about the fact that someone stepped up to help even though it didn't work out well.
事實上，我boss的boss對這個mistake也非常不高興。
--> It shouldn't be the reason to make you more upset or not. Your boss and your boss's boss will take care of each other.
可能是我太小人了，我覺得他就想在同事之間making balance, 不想任何人出頭，然後他可以 in charge.
--> If it is true, it is normal. Congratulations you are not alone
