难达到

We had to make sure that there was enough lubrication to avoid the discomfort of friction for her, but not too much lubrication or I could not have enough glans sensation to reach orgasm easily.

我们必须保证有足够的润滑剂来避免对她不舒服的摩擦，但润滑剂又不能太多了否则我会很难达到高潮。

He'll hardly reach his aim, because he strains at gnat.

他很难达到目的，因为他这人太拘泥细节了。

However, some will have a hard time with this approach, since it seems to "go against the grain".

然而，有些人很难达到，因为其似乎与常理很矛盾。

As we know for pancreatic cancer there is no cell line for big animal transplantation,so the experimental study for screening optimal interventional chemotherapy drug schedule is hard to perform.

但是所有这些药物都面临毒副作用大，患者耐受性差，用药剂量很难达到最佳治疗剂量，而且最重要的是有效率较低。

Along with technical progress, people uses for the mouse comfortableness and convenient set a higher request, but the ordinary wired mouse already the very inaccessibility people's goal, this time one kind wireless, could operate in any environment the intelligent remote control mouse has become people's first choice.

随着科技的进步，人们对鼠标使用的的舒适性与便捷性提出了更高的要求，而普通的有线鼠标已经很难达到人们的目标，此时一种无线的、能够在任何环境中操作的智能遥控鼠标就成为了人们的首选。

Beijing's decision to join the Bank's International Development Association is seen as a personal triumph for Bank president Robert Zoellick.

这两个国家很难达到其它捐赠国的增幅，因为自从国际开发协会上一轮融资以来，两国的货币均已贬值。

Unfortunately, this makes it difficult for them to achieve intimacy.

不幸的是，你们很难达到真正的亲密无间。

Previous studies, however, showed that the individual application of SLN, NLC and iontophoresis is too limited in the enhancement of drugs delivery.

研究表明单独使用SLN、NLC或离子导入技术，对大部分药物的促渗作用是有限的，很难达到治疗要求。

The mankind has been destined to live in island universe isolating individually by oneself since born, thousands and hundreds years, people pursuing the real love show it is difficult to uniform two single bodies completely.

人类自出生后，便注定生活在自己个别隔离的岛宇宙内，千百年来人类对爱情的可歌可泣的追求，表明很难达到两个孤立的个体完全合而为一。

The calculating formula of parabola and the length of ellipse arc can be found in the old handbook of mathematics, but it is inconvenient to be used in practice, especially, the accurate value is too difficult to get to.

关于抛物线和椭圆弧长的计算公式在数学手册和有关用表中早就可见。但实际上用起来很麻烦，其精确值也较难达到。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷