难以

When in doubt, hold on to your altitude. No-one has ever collide d with the sky.

当你难以作决定时，请保持高度，因为没有人会跟天空相撞

But the accuracy of laser collimator is hard to increase for the influenceto laser beam in the atmosphere.

但激光束在大气中的准直还是受很多因素的影响而使得激光准直仪的精度难以提高。

Compared with size control, morphology control is more difficult to achieve by means of the classical procedures of colloid chemistry.

传统的胶体化学方法难以对材料的形貌和尺寸进行控制。

In fact, it is difficult to conceal sales booming colony formation potential.

事实上，这是难以掩饰的销售蓬勃发展的集落形成的潜力。

Sometimes he consoled himself by that. But indeed he knew that he wasn't much better than any of those nigger servants who worked in those rich families. He had nothing but a poor job on the fancy boat. He could be very upset and depressed. But he couldn't leave his job; he needed it to make a living. Also he loved his job for he could at least take a close look at the life he probably could never reach. The luxurious boats where he worked somehow would represent Anthony's dream of life ? beautiful women in the fancy dresses, gentlemen throwing cash on the gambling tables, drunk politicians talking quibbles, coltish young ladies flirting and laughing at the bar… Life seemed so beautiful there. Anthony thought he was also part of this life until the War Between the States broke out.

有时候他这样自我安慰着但他真正明白的他并不比那些富人家的黑人奴仆好到哪去他除了在豪华游船上的一份可怜的工作以外一无所有他因此会心烦和沮丧但他却不能扔掉他的工作他需要这份生计同时他也爱着他的工作因为至少他可以好好地窥视着那种他也许永远也难以触摸的生活方式他所工作的奢侈的船上不知何故却有着安东尼的梦想生活——华贵衣裙里的漂亮女人们往赌台上扔钱的绅士们喝醉酒的政客侃大山轻佻的年轻女子在酒吧中调情欢笑……生活在这里看起来那么的美好安东尼以为他也这生活中的一部分直到内战爆发

Colville calls this is an almost unimaginable situation for children and other civilians to have to live through for even one day, let alone months on end.

Colville说，对于孩子和其他民众来说在这里居住一天都是难以想象的，何况是几个月。

In my mind, that's a hard combination to resist.

在我的心目中，那是一个难以抗拒的组合。

To provide comprehensive information and objective prediction results for decision-makers, a method to define combinatorial weights for different models based on self-learning approach was proposed.

为解决单一扩散模型难以可靠预测产品市场扩散行为的问题，为决策者提供全面的信息和客观的预测结果，提出了一种运用自学习方法确定不同模型的组合权重的方法。

As is known to all, cigarets contain nicotine which is harmful to people, but many smokers can't give it up. Therefore, getting rid of this habit is a big problem for them. And phenomena can happen quite ofen that the cigarets come back to some smokers life again after several days' suspending.

众所周知，香烟中含有对人体有害的物质尼古丁，但许多烟民都难以摆脱它的束缚，戒烟即成为他们的一大难题，经常会有此类现象发生：在戒烟几天后，香烟再次回到戒烟者的生活中。

It is this gesture which has helped the girls come to terms with their terrible grief.

正是母亲的这份良苦用心帮助姐妹俩战胜了令人难以承受的巨大悲痛。

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