Such a mistake would perhaps lead to disastrous consequences.

这样一种错误可能导致灾难性的后果。

Cass Frederick realized immediately that he had made a disastrous, maybe fatal, mistake.

卡斯'弗里德里克立即意识到，他犯了一个灾难性的、也许是致命的错误。

You need to be aware that being nervous is not a bad thing at all and you have every right to be cautious, as a serious mistake can be disastrous.

需要注意的是，你正在紧张不是坏事，你有权在任何要小心，作为一个严重的错误，可不堪设想。

Different from making a mistake in China, when you are abroad, a slight mistake can cause a disastrous situation, because you don't have as much as you have in China to compensate this mistake.

与在国内犯错的情况不同，在国外，一个很小的错误就可能造成无法收拾的局面，因为你不像在国内那样拥有很多可以对错误进行弥补的资源。