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Because of the non-linearity, time- variability, multi-parameter, intense coupling of the heating process and especially, the random interfere and anfractuosity of process, precision mathematics model is difficult to be established. The routine PID algorithm can not meet the requirement of control.

高岭土回转窑的加热过程中存在非线性、时变性、多参数强烈耦合这些问题，且随机干扰以及过程机理错综复杂，难以建立被控对象的精确数学模型，采用常规的PID算法很难达到控制要求。

Once the otolith thickness age relationship was established, the simple process of measuring otolith thickness was as effective for determining the age of gray angelfish as the far more difficult process of sectioning and reading the otoliths.

一旦耳石厚度与年龄关系建立起来，一种简单的预测灰刺盖鱼年龄的方法就建立起来了，比传统的磨片读书方式容易多了。

The gyro gunsight at last solved the most difficult problem faced by pilots and air gunners, that of finding the correct angle of deflection or 'lead' needed to hit the target when it was moving across the line of fire.

陀螺瞄准镜最终解决了飞行员和空中射手面对的最困难的问题，那就是在目标横越发射线的时候，找到正确的命中目标所需要的前置角度或者提前量。

The Gyro Gunsight Mk I - Pt I 陀螺瞄准镜Mk I -第一部分 The gyro gunsight at last solved the most difficult problem faced by pilots and air gunners, that of finding the correct angle of deflection or 'lead' needed to hit the target when it was moving across the line of fire.

陀螺瞄准镜最终解决了飞行员和空中射手面对的最困难的问题，那就是在目标横越发射线的时候，找到正确的命中目标所需要的前置角度或者提前量。

However, determination of an angle of refraction for a ray passing through a boundary between transparent and stronglyoptically-absorbing media is still quite difficult.

这一定律被广泛应用于透明物质，但应用在金属吸收介质(即光线通过吸收介质/介质边界)时的情况，至今仍是一个未被很好解决的难题。

Pretilt angle is a key parameter for various nematic LCDs. Since it is difficult to measure the pretilt angle of the cell with non-zero twist angle, Usually regarded as same to that in antiparallel one.

2预倾角是制造各种向列液晶器件都需要控制的参数，由于很难测得扭曲盒中的预倾角，传统的方法认为它与均匀排列平行盒的相等。

When I have a difficult problem, I try to look at it from different angles in order to come up with

当我遇到难题时，为了解决问题，我会尽量从不同的角度来看待它。

If you don't have a lot of experience modeling, however, it can be difficult to create a character you'll be happy spending much time animating.

如果你没有很多的经验模型，但是，它可能很难创造一个人物你是幸福的花太多的时间动画。

However, it is difficult for spectral domain OCT to obtain the anisotropic information of the biological tissue.

近年来，频域OCT作为一种新的OCT技术正在逐渐受到研究者们的关注。

The results showed that the trace elements were not anomalously enriched. Zn and Cu existed in sphalerite. Cr, Pb and Cd were adsorbed by clay minerals. Ba might exist in ankerite and calcite. Ni, Mo, Co and As mainly existed in pyrite. Be and Se were combined with organics. Many trace elements were difficult to volatilize. Because of high content and volatility, Pb and Zn, are harmful to environments; Zn and Pb separately exist in sphalerite and clay minerals, so it is easy to reduce their environmental damage by washing and processing of coal.

结果表明：研究的元素没有异常富集；Zn和Cu赋存于闪锌矿中，Cr、Pb和Cd被粘土矿物吸附，Ba可能赋存于铁白云石和方解石中，Ni、Mo、Co和As主要赋存于黄铁矿中，Be和Se以有机结合态存在；研究的元素大多不易挥发，但Zn和Pb易挥发，且含量较高，环境危害较大，Zn和Pb分别赋存于闪锌矿和粘土矿物中，可通过洗选脱除减小其危害。

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％。