间变

Time series analysis is one of the important methods about economic research field.

时间序列分析方法是经济领域研究的主要工具之一，它用合适的模型描述历史数据随时间变化的规律，并预测经济变量值。

Results After anterior cervical decompression with trepan and fusion of BAK implantation,the Cobb's angles were smaller than pre operation and there were no difference in the cervical lordotic angles,intervertebral space heights.

结果 颈椎前路环锯减压BAK融合器植入融合后Cobb角较术前变小，而椎间高度和颈椎前弯度手术前后无显著性差异，随访期间则三者均无显著性差异。

In this work,the finite friction force between the refuse and the trommel screen was taken into account,and the relationship between the hoisted angle and the rotary speed was co-related.

从生活垃圾在滚筒筛内的受力分析着手，考虑了物料与滚筒筛筛壁间的摩擦力，其为一有限值，推导出物料的提升角与滚筒筛转速的关系，且物料提升角的大小取决于物料静摩擦角的大小；认为无论滚筒筛的转速多大，物料的最大提升角都是固定不变的。

The correlations among the parameters suggested that larger trophozoite had its shape closer to round but the shape of nucleus changed little.

参数间的相关系数显示，随着滋养体增大，虫体的形态变圆，而核的形态变化不大。

The tube mill is a typical MIMO system with long time delay and time changing apparently. It has the characteristics of simple lagging, great inertia and non-linearity. The mathematical model is hard to be established and changed slowly with the elapse of time.

球磨机制粉系统是一个典型的多变量非线性时变系统，各控制量和被控量之间存在着相当严重的耦合，且球磨机具有纯滞后，大惯性的特点，数学模型难以建立且随时间缓慢变化。

Therefore, the mechanical properties especially the toughness of TWIP steels can be improved by way of controlling its heat treatment process to increase the number of CSL boundaries in original structure.

CSL晶界对材料的抗晶间腐蚀、断裂和蠕变强度的提高均有有益的作用，因此，通过控制TWIP钢的热处理工艺来提高原始组织中特殊晶界的含量，可以提高TWIP钢的强韧性。

As oft 'twixt May and April is to see

变得像四月或五月间的风暴

The result shows that the specific thrust performance of ITB engine is better;the specific f uel consumption curve is toning down with the varied cycle parameters mentioned above, the range which cycle parameters can b e selected is wider than that of conventional engine.

结果表明：这些循环参数变化时，涡轮级间燃烧室发动机单位推力增长幅度较大，耗油率性能变化曲线趋于平缓，发动机综合性能提升，循环参数的可供选择范围变宽。

A state variable feedback based system control approach, which indirectly controls load voltage by means of controlling the supply current, is proposed, thus the problem that the undamped DC transient component of supply current, which is caused by the linking inductance between power supply and power loads under PI control mode, is solved.

分析了仅由1套逆变器构成的并联型综合电能质量调节器的结构特点和控制目标，提出了一种基于状态变量反馈的系统控制方法，通过控制电源电流来间接控制负载电压，很好地解决了常规比例–积分控制时电源和负载间的连接电感所导致的供电电流直流暂态分量不衰减的问题。

The number of snow flakes carried in the rain has increased abruptly, and the view has become vaguer than ever.

雨中的雪花陡然间增多了，远远近近愈加变得模模糊糊。

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％。