Parents must be firm with their children.

父母必须对子女严格。

《牛津词典》

She had to be firm with him. "I don't want to see you again."

她不得不坚定地对他说：“我再也不想见到你。”

《柯林斯英汉双解大词典》

You must be firm with your dog.

对待你的狗时态度要坚定。

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Sometimes, the best way to get a point across to an employee is to be firm with him or her in front of other staffers.

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Parents should be firm with their kids, say advisers, by making them pay for rent and other expenses if possible, setting a limit for how long they are allowed to stay, and avoiding the temptation to offer extra financial help, like loans.

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The new potatoes should be firm, with tight, thin skins.

WSJ: Spring Vegetables With Green Goddess Dressing