Now that you are grown up, you must stop this behavior.

现在你长大了，你必须停止这种行为。

youdao

Now that you are grown up, you must stop this childish behavior.

既然你长大了，你必须停止这样幼稚的行为。

youdao

"Now look here, you--you thick-headed beast," replied the Rat, really angry, "this must stop."

“喂，你听着，你——你这头蠢兽，”水鼠兰特非常生气地说，“这种事必须停止。”

youdao

The fact is, at this stage of the game, there is no one-stop shop for learning everything you must know to be CMO.

FORBES: Seeking CMOs: Must Know Big Data and Digital Marketing