难完成的

This paper discussed the algorithm of horizontal obligue axonometric projection of shade and shadow on spheric surfaces in light ray and projection directions.

对于任意方向的光线，作图很难完成。本文给出了任定投影方向，任定光线方向，圆球及其阴影的水平斜轴测投影的算法。

You can hardly expect a happy life in a country where compulsory education is not carried out.

在一个连义务教育都无法完成的国家里，是很难想象幸福的生活的。

Understanding your tolerance for risk is only half the equation. Here's the messier part: How much risk do you need to take?

了解自己的风险承受力仅仅完成了一半的工作，还有一个更难回答的问题：你需要承担多大的风险？

This paper gives a detailed presentation of all the current algorithms for the problems of the five classes,and puts em- phasis on the analysis and comparison of the technique used in those parameterized algorithms.

引言Set Packing问题是在理论和实践中基本的组合问题，是一类重要的NP难问题lj，被广泛应用于调度、代码优化和生物信息学等领域。如在线性调度领域中，算法必须在不知道每个工作要多少时间完成的情况下调度许多的作业。

Diplopia and disturbance of ocular movement are related to the incarceration of the extraocular muscles and the displacement of orbital wall, and the management is simple relatively. However, the treatment of enophthalmos is difficult because the orbital reconstruction is made to be complicated by the complex morphous of orbital wall and the limited operative area. This study introduced the use of CAD/CAM technique in orbital reconstruction, and the result is more satisfactory than traditional methods.

眶壁重建是其矫治的首要条件，然而，眶壁形态复杂，并有视神经由眶尖通过，加之术野受限，使精确的解剖复位很难完成，本文应用CAD/CAM技术，术前成型钛网并行眶壁重建，通过CT分析和眼科检查，证实该技术在眶壁重建的精确性上均较传统方法有明显提高，其中，眶内壁的修复程度和眶底修复形态的对称性，以及眶容积缩小程度反映了其形态修复的精确性，而置入深度则体现了在缺损修复范围设计中的优越性。

The WHO says about 6 person of children show some singals, the majority are male, the national center for learn disability says people dyspraxia troble planning completing fine moter gesture, the brain has trouble send message to the body, to do what person want.

运动障碍症是身体运动系统紊乱导致的。世界卫生组织指出，大约有6成的儿童有运动障碍的迹象。大部分是男性。联合国残疾人研究中心指出，运动障碍症患者，很难有计划的，完整的完成机动性任务。

No vacuum metalizing.

Fred：不，我们利用了真实的电镀制程，没有真空金属化，那会更难穿且真空金属化的问题是容易碎裂又太薄，这里有一张我们电镀完成的C-3PO，我想影迷们会喜欢的。

Paintings (1916) integrates his critiques of paintings and his analysis of Chinese history and politics. Rene Leys (1922) mixes autobiography and fictional stories. Even his unfinished piece, Essay on Exoticism: An Aesthetics of Diversity, cannot be counted as an academic essay in a strict sense although it has a serious essay title.

莱斯》（Rene Leys，1922）将自传和虚构混杂在一起；即使那本未完成的《论异国情调》（Essay on Exoticism： An Aesthetics of Diversity）也是如此，虽然有着一个中规中矩的论文标题，却很难算是严格意义上的学术论文。

Paintings (1916) integrates his critiques of paintings and his analysis of Chinese history and politics. Rene Leys (1922) mixes autobiography and fictional stories. Even his unfinished piece, E ssay on Exoticism: An Aesthetics of Diversity, cannot be counted as an academic essay in a strict sense although it has a serious essay title.

莱斯》（ Rene Leys ，1922）将自传和虚构混杂在一起；即使那本未完成的《论异国情调》（ Essay on Exoticism： An Aesthetics of Diversity ）也是如此，虽然有着一个中规中矩的论文标题，却很难算是严格意义上的学术论文。

Achievable by unsupported people. Therefore we must do it bare-handed going

很显然，这里所提出的是一件严肃的事业，无支援的人通常很难完成它。

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。