1.
She has made a grievous mistake.
她犯了一个极严重的错误。
2.
This was a grievous error.
这是个严重的错误。
3.
I made a grave mistake.
我犯了一个严重的错误。
4.
That' s a bad mistake.
那是一个严重的错误。
5.
a grave mistake, error, etc
严重的错误、 过失等.
6.
His error is of a serious nature.
他的错误情节严重。
7.
We have made a serious mistake and have no intention of sweeping it under the mat.
我们犯了严重的错误，但并不想掩盖错误。
8.
If small offences are passed over, they may lead to more serious one.
若小的错误被忽略，那就会导致严重错误。
9.
I made a mistake, and a very bad mistake at that.
我犯了一个错误，而且是一个严重的错误。
10.
His costly mistake resulted in severe loss.
他的严重的错误导致了重大的损失。
11.
He'd made a serious mistake, and it was no use trying to minimize its seriousness.
他犯了严重错误，试图低估它的严重性是没用的。
12.
To be blind to this will lead to the gravest error.
对这视而不见的话会导致严重的错误.
13.
To my way of thinking, they are making a serious mistake.
照我的想法，他们正犯一个严重的错误。
14.
This is a serious error of principle.
这是严重的原则性的错误。
15.
Your English essay is seriously flawed.
你的英语作文有严重的缺陷（错误很多）。
16.
A serious mistake has turned up in the planning.
在规划方面发生了一个严重的错误。
17.
Specify the error or severity level that triggers the alert.
指定触发警报的错误或严重级别。
18.
Gross errors were made by the Transport Commission.
遣送委员会犯下了严重的错误。