We could not afford to overlook such a serious offence.

对这样严重的违法行为，我们决不能视若无睹。

Driving with excess alcohol in the blood is a serious offence.

血液里酒精含量过高时驾车是严重的违法行为。

Driving while drunk is a serious offence.

酒醉驾车是严重违章。

Speeding is a serious offence resulting in high fines.

超速行驶是严重的违规行为，会被严重罚款。

She knowingly concealed the truth. That's a serious offence.

她故意隐瞒了事实。这是个严重的违法行为。