不得不

To get the axis of the crankcase hole and the axis of the cylinder boring at the best angle (90 degrees) you will have to make an assumption about the temperature difference of the exhaust side and the opposed side or measure it in a wind tunnel.

得到的主轴，曲轴箱孔和轴的气缸镗在最好的角度（ 90度），你将不得不作出一个假设有关温差排气方和反对方或措施，它在一个风洞。

Peter had to give back Azov, demolish his Dnieper and Taganrog fortresses, withdraw his army from Poland, and allow Charles to return to Sweden.

彼得不得不放弃回到亚速海，拆卸他第聂伯河和塔甘罗格堡垒，撤回他的军队从波兰，并允许查尔斯返回瑞典。

B:Yes,l've got to③,if I want to pass all the exams.

是啊，如果我想通过所有的考试，就不得不这样。

E.g. She has to babysit her little brother when her mom goes to work in the evening .

当她妈妈晚上上班的时候，她不得不照顾她的小弟弟。

Respecting is in the fraud action in the rank, june 2000 center of information of portion China internet network (the cogged phenomenon that the outstanding Chinese website that CNNIC) place undertakes judges pitch on is more outstanding, appear a little absurd even, pose a lot of criticism and doubt, become Bacchic temporarily heat news, CNNIC must stop the selection activity of Chinese website accordingly later.

说到在排名中的舞弊行为，2000年6月份中国互联网络信息中心所进行的优秀中文网站评选中的作弊现象更为突出，甚至显得有些荒唐，引起很多批评和质疑，成为喧闹一时的热点新闻，后来CNNIC因此不得不终止了中文网站的评选活动。

They are now having to back away from that a little as the violence spreads into middle class suburbia.

他们现在不得不退避三舍，从一个非常小的暴力蔓延到中产阶级郊区。

Finally we had to leave, but still managed to get some last views of this beautiful bay when going back to the car.

最后我们不得不离开，不过在回去停车的地方，沿途上我们还可以最后再欣赏一下海湾的美景。

As a result, his plans to expand capacity have been put on the back burner.

因此， 他不得不把扩大生产力的计划搁置了。

Back 'down; US back 'off give up a claim to sth; yield 放弃对某事物的要求;屈服: He proved that he was right and his critics had to back down.

他证明了他是正确的，而那些非难他的人不得不收起他们那一套。

He had to back down under pressure.

在压力下他不得不退缩。

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。