难点

Designing the looseness of a lapel collar is not an easy work. In this research, the impact of the fabric performance on the rule of looseness of lapel collar is studied.

针对翻驳领结构设计中的一大难点－倒伏量，主要研究面料性能对倒伏量变化规律的影响。

Special difficulties 难点 A group of enthusiasts are going to have the plane repaired. Collective noun+ singular or plural verb.

当我们把这个名词人格化时，即看作组成整体的若干人时，连用的动词应为复数。

How to fast, accurately and effectively segment objects in the color images is the key point in the computer vision and image analysis.

如何对彩色图像中的目标进行快速、精确的有效分割是计算机视觉和图像分析的重点和难点。

Increasing the selective reduction ability of NOx under lean burning condition, enhancing the thermal stability and decreasing the light-off temperature of the catalysts are the three key researching hot points in the area. And quality of the honey comb g-Al2O3 coatings, additives and the preparation parameters are the major effectors of the catalytic activation of the catalysts.

目前对单钯三效催化剂的研究的热点和难点在于：1 提高催化剂对氮氧化物的选择还原能力； 2 增强催化剂的高温热稳定性；3 降低催化剂的起燃温度。g-Al2O3 性能质量，助催化剂的选择及用量，涂层及催化剂的制备工艺等对单钯三效催化剂的催化活性起决定性作用。

Increasing the selective reduction ability of NOx under lean burning condition, enhancing the thermal stability and decreasing the light-off temperature of the catalysts are the three keyresearching hot points in the area. And quality of the honey comb g-Al2O3 coatings, additives and the preparation parameters are the major effectors of the catalytic activation of the catalysts.

目前对单钯三效催化剂的研究的热点和难点在于：1 提高催化剂对氮氧化物的选择还原能力； 2 增强催化剂的高温热稳定性；3 降低催化剂的起燃湿度。g-Al2O3 性能质量、助催化剂的选择及用量、涂层及催化剂的制备工艺等对单钯三效催化剂的催化活性起决定性作用。

Combinational ambiguity is one of the most difficult problems for Chinese word segmentation.

组合型歧义字段切分是中文自动分词的难点之一。

Socialism is basic the combinative problem of system and market economy, it is a key of course of Deng Xiaoping academic generality and difficulty.

社会主义基本制度与市场经济的结合问题，是邓小平理论概论课程的一个重点和难点。

Job-shop scheduling is a typical combinatorial optimization problem, and large scale scheduling optimization is one of such difficult optimization problems.

作业车间调度是一种典型的组合优化问题，大规模的调度优化是该类问题的难点。

Based on the concepts presented above, four types of new models are proposed:(1) a production system adopting single operational strategy and setting common buffer,(2) a production system adopting single operational strategy and not setting common buffer,(3) a tandem production system adopting hybrid operational strategies,(4) a supply chain adopting hybrid operational strategies.

所谓对称，是指在生产系统分解后，同一个搬运车既作为某个子系统的输出端，同时又作为另一些子系统的输入端。对称分解方法的难点在于，在子系统中，搬运车的服务过程不同于原来的服务过程。在子系统中，把原系统中的阻塞和空闲等待过程，模拟成虚拟的服务过程，所以需要计算阻塞和空闲等待时间。

Therefore, various types of common crime is the criminal law has been a hot research and academic difficulties.

因此，共同犯罪领域的各类问题一直是各国刑法学界研究的热点和难点。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。