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The task for air defense and antimissile guided missile is more and more difficult because mass precision guided munitions is used on seat of war.

由于精确制导武器在战场上的大量使用，防空反导的任务将比现在更加艰巨。

Itching a bit during pregnancy is normal, but if the situation worse, making it difficult antipruritic, to recommend or to the hospital to check properly.

怀孕期间有点搔痒是正常的，但如果情况严重，难以止痒的话，建议还是到医院检查一下妥当。

And general small-scale businesses are using a more antiquated management methods, it is difficult to conduct effective operations and management.

而一般的小型的商户都是使用较为陈旧的管理方法，很难进行有效经营和管理。

Aircraft antiskid braking system is complicated and nonlinear and it is so difficult to establish its exact model.

由于飞机防滑刹车系统的复杂性和非线性，建立其准确的动力模型比较困难。

To solve the difficult problems mentioned above and to conquer the shortcomings of existing technologies,we considered it necessary to purposely design a high-performance classification model and corresponding algorithm at first;and then to study its application methods;at last,to build up a practical on-board PDS antitype system based on the proposed model and algorithm.

针对行人检测系统与关键技术存在的上述难点问题，我们认为有必要研究出针对性的高效分类模型与算法，设计面向应用的实现技术，最终搭建一个具有实用价值的行人检测原型系统。

To prove validity of vaccines and antiviral drugs, and not so difficult as long as the appropriate method.

要想证明疫苗和抗病毒药物有效与否，并没有那么难，只要采用适当的方法。

If it is difficult to enter the anus, you probably need more lubrication.

如果是难以进入肛门，你可能需要更多的润滑。

This type of anxiousness can truly make it difficult for the person to function on a daily basis and can lead to phobias and unwarranted fears .

这种忧难以真正发挥作用的人就可以每天引起不必要的恐惧和仇视心理。

The operation sex of this one practice also is oppugned, as a result of Internet cross district sex, how to limit apanage to register the difficult problem on existence technology, and the provision that countrywide other province did not implement net inn license plate, selling the home very hard certainly is to be in Beijing to still sell a thing in Chengdu.

这一做法的操作性也受到质疑，由于互联网的跨地域性，如何界定属地注册存在技术上的难题，而且全国其他省份并没有实施网店牌照的规定，很难确定卖家是在北京还是在成都卖东西。

It must be difficult to be apart.

要分开是非常不容易的。

The dissecting of samples in group2 were difficult. The root of pulmonary artery and ascending aorta failed to be unfolded because fibrous tissue was tough, right and left fibrous trigone were too firm to be solved by hand. Cardiac muscle fibers couldn't be stripped along myofibrillar trajectory since they were prone to break because of their friability.

组2的心脏解剖困难，表现为纤维组织坚韧，游离肺动脉非常困难；徒手无法松解左、右纤维三角，肺动脉和主动脉根部的游离非常困难；心肌纤维坚硬、质脆，解剖时容易断离成碎块，无法沿纤维走行方向剥离。

We have battled against the odds in a province that has become increasingly violent.

我们对在一个争夺日益激烈省的可能性。