不得不

Be obliged to sb.be obliged to do sth.

不得不，必须做某事

When a person doesa certain thing again and again, he'll be obliged to do it in the same way by some unseen force. Thus habit is formed.

当一个人反复的做某件事时，他就会被某种看不见的力量驱使不得不以同样的方式再去做这件事，于是习惯就形成了。

Be obliged to do sth .

不得不做某事

Then we will be obliged to defend our citizens and children, he said.

那么我们将不得不保卫我们的公民和儿童，他说。

You shall not be obliged to take any steps to verify the identity of such a person.

你将不不得不采取任何步证实这样的一个人的身份。

If you cannot deliver the goods on time, I shall be obliged to send you to court.

如果你不按时交货，我就不得不将你告上法庭。

If you don't drive carefully, I shall be obliged to deprive you of your licence.

如果您不谨慎驾驶，我将不得不没收您的执照。

If you do not drive carefully, I shall be obliged to deprive you of your license.

如果您不谨慎驾驶，我将不得不没收您的执照。

If you don't drive carefully , I shall be obliged to deprive you of your license.

如果您不谨慎驾驶，我将不得不没收您的执照。

I had better not pass my word: I might be obliged to break it.

我最好不做什么许诺，我有可能不得不食言。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。