It is not necessary for an official to give a warning prior to issuing a more serious penalty.

裁判员在对运动员做出更严重的处罚前没有必要事先向其出示警告。

youdao

I do want to give a warning about the dangers of drinking too much water before a race. This is known as water intoxication or "hyponatremia," and it can be deadly.

我想在此给出一个警告，赛前饮水过量危险，即水中毒或“低钠血症”，它可以是致命的。

youdao

Roger said that was a nice sentiment, but he was calling as my friend to give me a fair warning.

罗杰说，这种情绪很不错，但是他是以朋友的身份打电话来给我一个合理的警告。

youdao

Mr Pickles used the announcement to give a veiled warning to councils - which have a statutory duty to provide an efficient bin service - that do not have weekly collections.

BBC: Eric Pickles warns councils over weekly bin collections

The majority of security testers agree that the ethical thing to do when they discover a flaw in a computer programme is to give the manufacturer sufficient warning for it to prepare a software patch before going public with the finding.

ECONOMIST: Guard yourself against identity theft

But it would give a warning to investors in shares and houses that the good times cannot last forever.

ECONOMIST: American interest rates