难达到

As there are many abstract concepts in this course, it is hard for the traditional teaching method to help students to have a visual view of these concepts, and can't attaint an ideal and expectant teaching effect.

课程中涉及了许多抽象的概念，用传统的教学方式很难使学生对这些概念有比较直观的认识，也就无法达到理想的教学效果。

Just what exactly the final tally will be is hard to say with certainty, but it will probably be about $70 billion instead of the $28 billion now talked about, thus making its electricity among the most expensive ever produced.

虽然目前最终的成本数字还很难准确计算，但是很可能会达到700亿美元，而不是现在说的280亿美元，这会让三峡电厂的发电成本为世界之最。

And so the tests are difficult to pass to reach Bodhisattva.

因此，测试是很难通过来达到菩萨级别的。

Also from the legend to switch to the journey of fantasy, the feelings of my characters to write the article, there has been quite mixed, I have always been due to speak harsh words known for aggressive cutting edges, but not offended countless people, in fact, is the husband's generosity and vision has first time for me to resolve to resist the numerous仇怨and accusations, and I also sharp Caltrop husband gradually softened by the gentle water, the so-called近朱者赤, although I can not reach the level he did, but at least knew almost Cat channel in the world with the end of the唇枪舌战not to humiliate the enemy was not ridiculed还嘴will never give up the power of the scene is vibrant with life itself, the broader picture, not less obedient, and friends will be more natural the.

从传奇到幻想又转换到征途，我所在写下的心情文字文章颇多，褒贬不一，我也历来因说话苛刻言辞锋利咄咄逼人而闻名，得罪人无数却不以为然，其实是老公的仁厚和胸襟却一次次为我化解抵挡了无数的仇怨和指责，而我锋利的菱角也渐渐被老公的温柔如水所软化，所谓近朱者赤，虽然我无法达到他那样的境界，但是起码旷世猫猫已经几乎在世界频道上终结了与人唇枪舌战不把敌人羞辱讥讽得无还嘴之力绝不罢休的场面，与人生气其实是自己生气，退一步海阔天空，难听话少了，朋友也就自然多了。

The phase of optical wave can be recovered by the intensity transport equation under the paraxial approximation For the optical system with diffraction limit, it is difficult to get the boundary radical slope of phase and sample in the circular domain boundary when using the intensity transport equation to recover the phase, consequently, we reviewed an algorithm mentioned in the reference ［4］, namely, the equation, computation domain and boundary condition are changed, then the phase is reconstructed by the multigrid method and corrected at last Moreover, the experiment system is set to testify the algorithm, and the recovered phase from the intensity data detected by CCD is compared with the result from phase retrieval algorithm, it is found that the phase reconstruction error can reach 017 λ in the case of non-uniform intensity distribution, as a result, the method is suitable for the phase recovery with low wavefront sensing accuracy.

在傍轴近似条件下，可以利用光强传播方程对畸变波前进行相位恢复。对于衍射受限的光学系统，很难获得相位的边界径向斜率值作为边界条件，此外，要获得精确的圆域边界采样值也并非易事。为了克服上述困难，进一步研究了相位恢复改进方法，即改变了方程的表示形式、计算区域和边界条件，并用多重网格法进行求解获得重构相位，最后再将其修正。为了验证算法的精确性，搭建了实验系统对算法进行实验验证，将由CCD探测的光强分布进行计算得到的相位分布与相位恢复算法的结果进行比较，证明在光强分布非均匀的情况下，该方法恢复的相位均方根误差能够达到017 λ，可以适用于波前传感精度要求不是很高的相位恢复。标签自适应光学相位恢复相位修正光强传播方程 adaptive optics phase retrieval phase correction intensity transport equation

Without the wide compass and the flexible voice, it is difficult to exhibit the artistic effect of the coloratura mezzo-soprano.

如果没有宽广的音域和灵活的声音，花腔女中音是很难自如发挥达到艺术效果的。

Since it is difficult to achieve complete orthogonal spread spectrum code sequence, and sometimes impossible to achieve orthogonal in the CDMA system, there were major multiple-access interference, greatly limiting the capacity of the system users.

摘要由于扩频码序列很难实现完全正交，有时甚至是不可能达到正交，在CDMA系统中存在着严重的多址干扰，极大地限制了系统用户容量。

Many people reported constant speed fuel consumption manufacturer criticism is in reality impossible to achieve.

很多人诘难厂家公布的等速油耗，在现实中都是不可能达到的。

Nowadays, the competition among enterprises has turn white hot. In face of becoming a member of WTO, overseas medical tycoons eye covetously or menacingly. They are gonging to enter into Chinese market.

当今社会企业间的竞争已达到了白热化的状态，在面临我国已正式加入世贸组织，国外医药巨头虎视眈眈，即将全面进入中国市场，同时在国内同行业企业前堵后追的夹击下，给企业的生存和发展提出了更难的课题。

But I do not have cosmetic so great power, although had been imperial crown class, although such credence is accumulated, very difficult also one make known to lower levels arrives such quantity.

但是化妆品我没有那么大的力量，虽然已经是皇冠级了，虽然有这样的信用积累，也很难一下达到这样的量。

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