是不是

But they were separated by Allie's parents who disaproved of Noah's unwealthy family, and moved Allie away.

但是现在的教育恰恰相反。不知道这是不是一种遗憾。

Am I a fool? There is a wobbling feeling under my feet.

我是不是个傻瓜﹖我的双脚开始颤抖﹐站立不稳。

I don't know whether she despised me or not.

我不知道她是不是看不起我？

The studies exploring the relationship between HPV infection and laryngealcarcinoma began in 1980s,since then,almost all the research was aimed at theinvestigation of the HPV prevalence in the biopsies,due to differences in thechoice of DNA detection method,cell sampling and the geogen,the prevalenceestimates of HPV have varied accordingly,and led to two different points about therelationship between HPV infection and laryngeal carcinoma:some researchersdemonstrated that a higher HPV prevalence could be found in laryngeal carcinomas(from 50% to 90%)than in benign laryngeal lesions,suggesting a relationshipbetween HPV infection and laryngeal carcinoma;but the other researchers foundthat the isolation of HPV is no greater in the laryngeal cancers(from 5% to 43.3%)than in the normal larynx or benign laryngeal lesions,thereby questioning itsctiological significance,so,the role of HPV in the development of laryngealcarcinomas still remains unclear.

有关HPV与喉癌的研究始于80年代，但20多年来研究模式始终停留在对临床标本进行检测的水平上，由于各家采用的检测手段敏感性不同、标本数量以及来源地域也存在差异，使各家学者对喉癌中HPV阳性率的报道极不一致，并由此导致了两种截然不同的观点：一部分学者报告的喉癌标本中HPV阳性率高达50%~90%，并显著高于喉良性肿瘤，认为HPV与喉癌有关；而另有不少学者检测的样本中，阳性率（5%~43.3%）并不比正常喉粘膜及良性肿瘤高，认为HPV与喉癌无关，因此，HPV到底是不是喉癌的致癌因素目前仍无定论。

I bet he couldn't help me take the car in for a tune-up, could he?

他肯定不能帮我把车送来调试，是不是？

Until now I do not know is not true.

到现在我也不知道是不是真的。

Your idea sounds reasonable, but I wonder if you will bell the cat.

你的说法很有道理，不过我不知道你是不是敢担这个风险。

I don't know if this is emotionally stressful for caterpillars, but for humans it can be hell on wheels.

我不知道它是不是会给毛虫带来感情上的压力，但是，对于人类来说，这简直就是情感上的&上刀山下火海&。

Isn't it unwise to spend more than you can afford just to keep up with the Joneses ?

为了赶上别人而超出自己的经济能力乱花钱，这样做是不是不太明智？

Does that mean the rule becomes any less important to the business? Of course not.

那这是不是说这个规则对业务来说不那么重要了呢？

John Robbins lives with his family in Santa Cruz, California.

约翰罗宾和家人居住在加利福尼亚州的圣克鲁斯县。

The international background is mainly the economic ties among different nations tented to be widen and deepen at the peace and development times.

国际背景主要是和平与发展时代条件下的世界各国经济贸易联系的日益加深。