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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。

It is also indicated that decreasing either the apex angle of transmitter or receiver makes the detecting of the weak scattering more difficult while other parameters remain the same.

而增加发射机的发散角则基本不影响接收到的信号功率。在其他参数不变的情况下，增大接收机或者发射机的仰角都减小了接收机的探测到的信号功率。

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上，利用各种方法求得各种逻辑型、结构型控制器，解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面，有讨论，工程理事会和联盟关于延长工作时间短至9月底。