有困难

Nowadays, bone defect has become one of the most important disease which threat people's living quality severely. Today, the most common methods used to healing bone defects include: Autogenous bone grafts and allogenic bone grafts. But autogenous bone grafts have a shortage on donor, difficult to make shape and will bring a complicate disease on donor site; allogenic bone grafts often follow with graft rejective reaction, and have a potential risk of propagation of many disease.

目前，主要应用于临床骨缺损修复的方法有自体骨移植和异体骨移植等，但自体骨移植存在材料来源有限、供骨部位的损伤以及塑形困难等问题；异体骨移植也有潜在的疾病传播隐患以及移植排斥反应等严重后果，因此无论自体骨移植还是异体骨移植均无法完全满足需求，临床急需寻找一种安全有效的骨移植替代材料。

Section BiFeO〓 is known to have rhombohedrally distorted perovskite structure with the space group R3c, which allows the ferroelectric atomic displacement below 1083K and weak ferromagnetism below Neel temperature 643K simultaneously.

2具有Pt电极的SBT、BNT和BLT薄膜抗疲劳的原因主要有三种：稳定的氧八面体层导致氧空位迁徙困难；〓层对空间电荷有自我管理和补偿作用；畴壁解钉扎的速度很快，可以平衡畴壁钉扎的速度。

I had a busy sammer haliday , I got up early in the morning them l did sports that made me feel tired , But exercise helps make my body healthy and strong , I had breakfast at 7 o'clock , after,That lwent shopping , I bought many things from there ,Next ldid my homework , That was a little difficuly , In the afternoon ,I piayed games with my friends , I fell very happy , In the evening ,I did some reading then i went to bed

我有一个繁忙的暑假。我早晨提早起床，然后我去做运动使我感到疲倦。但是锻炼帮助我使我身体健康和强壮。我七点钟吃早餐，然后我去逛商场，我在那儿买了许多东西。接下来我做我的家庭作业，那是有一点困难的。在下午我和我的朋友玩游戏，我感到非常快乐。在晚上，我阅读然后睡觉。由此可见这是过去式的英语日记

Actually afore-mentioned 3 o'clock is the basiccest, also be to ensure when to you are doing a keyword, won't be dropped by K later, or fall easily a standard of authority, if stand newly to do a keyword directly, the rank is to have, did not have a few days to be dropped by K, such experience I had been experienced a lot of times, this also is the experience that come down is accumulated in ceaseless attempt, in fact experience told us, want to make flow, want to make money, so precondition should have a pretty website namely, although spadger is small, but the five internal organs is provided complete, meaning that is to say because your website is individual website what do not need to do is too large, make oneself maintenance very difficult.

其实上述三点是最基本的，也是确保以后你在做要害词时不会被K掉，或轻易降权的一个标准，假如新站直接做要害词，排名是有了，没几天就被K掉了，这样的经历我经历过很多次，这也是在不断的尝试中积累下来的经验，事实上经验告诉了我们，要想做流量，想赚钱，那么先决条件就是要有一个像样的网站，麻雀虽小，但五脏具全，意思就是说你的网站由于是个人网站不需要做的太大型，使自己的维护很困难。

Gradually, these strings of ragged people shortened and frayed away; and then poor lights began to shine in high windows, and slender fires were made in the streets, at which neighbours cooked in common, afterwards supping at their doors.

歪放在最倒霉的脑袋上的最破烂的睡帽都带着这样一种桀骜不驯的意思：&戴破帽的我知道过日子有多困难，但是你可知道戴破帽的我要你的命又有多容易？&

Material and Method: This retrospective study investigated 212 couples, i.e., sexual partners, who visited our offices because of unconsummated coitus due to failure to penetrate the vagina, of them, 129 couples completed the full course of treatment and follow-up.

材料和方法：由212对因为阴道插入困难，导致无法完成性交而至我们门诊的伴侣中，其中有129对完成了完整疗程的评估及治疗，并且有完整的追踪及病例可以查阅。

Keeping balncc of oxidation-reduction equation is a difficult problem in the chemical teaching, especially in high school. The author induced from a great wany materials a new mcthod, namely,"grasp one molecule", which is readily accepted by strdents.

氧化——还原方程式的配平是化学教学中的难题，特别在高中化学中，学生尤感困难，本文是作者从自身氧化还原反应，有单质参加和有单质生成的氧化还原反应诸方面归纳出一种学生易于接受的方法即&抓1分子法&。

This is generally defined as being identical in the length to the width of the footing in the direction normal to the analytical plane. However, there is little knowledge about whether the results obtained from the historic method analysis are overestimated or underestimated, comparing with those obtained from the applicable values. So in this paper a new methodology considering the soil-pile dynamic interaction for sea warf has been imposed.

在总结理论的基础上，指出土-结构动力相互作用目前的发展水平与工程实用之间仍存在相当大的差距，理论与实际之间也还有距离，这是由于土-结构动力相互作用问题本身的复杂性，不同的计算方法都引进了一些假设和进行了不同程度的简化，以致不同方法给出的结构和地基反应存在有很大的差别，加之计算工作量大，试验验证也比较困难，所以在实际的抗震设计中考虑桩-土共同作用是有很大的研究意义的。

Fogg had an abominable way of jumping from one boat to another, and, before anything could be effected, might get full under weigh again for Yokohama.

不论这个女人是不是有夫之妇，反正是诱拐妇女，因此就有可能在香港给这个得意忘形的骗子制造一些困难，叫他不论拿多少钱出来也不能脱身。

Results solid mass 78 cases, Cystic lesion 4 cases , Cystic and Solid lesion 31 cases. The lesion have clear smooth and intact capsule. The meningeal tail sign and Cranial Cortex burking sign are especial features, Cystic lesions qualitalive diagnosis is difficult and making diagnosis must be all-around ananyse.

结果： 实质性肿块78例，囊性4例，囊实性31例，病变边界清楚，外壁光滑，有较完整包膜，脑膜&尾&征和脑外皮质&扣压&征为其特征表现，囊性占位定性诊断有一定困难，需全面分析才能作出诊断。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。