你必须而且马上停止这种行为。

You must stop, and at once, this sort of behaviour.

youdao

虽说锡层脱落时这口锅还是能用的，但你必须保证每次在烧菜前用力擦洗锅子，而且菜一烧好就得马上出锅，因为烧好的菜可能会跟锡层已经脱落的铜锅发生有毒的化学反应，所以最好还是及时地重镀锡层。

If cooked food remains in a poorly lined pot, some kind of a toxic chemical reaction can take place. It is thus best to have the pot re-tinned promptly.

youdao

你必须告诉她，而且马上告诉她。

You must tell her, and that at once.

youdao