外界

One tube continually emits infrared ray,and the other receives the reflected ray.

过去常用测速机、脉冲发生器、模拟变换器等测速方法，由于易受外界因素的影响

Studies on basic working principles and designs of fiber lasersThe basic working principles as well as the major characteristics of laser and fiber lasers are firstly reviewed,including the interaction between light and matter, the laser oscillation conditions and the spectrum distribution,the gain characteristic and spatial hole burning effect,the influence of external environment on the stability of laser output and the actual limits of fiber laser bandwidth;The designs of bidirectional single-mode Er-doped fiber ring laser and multi-wavelength laser is then discussed,respectively;The characteristics of dynamic grating reflection spectrum of the fiber saturable absorber is systematically analyzed.?

在激光型光纤传感器的设计、实验现象的理论解释等方面做了如下的研究工作：光纤激光器的基本原理与设计方案概述了激光和光纤激光器的基本原理，包括光与物质的相互作用，激光振荡的条件及频谱分布等激光产生的基本原理：掺铒光纤的增益性质，空间烧孔效应和外界扰动对激光输出稳定性的影响，光纤激光器的实际极限带宽等光纤激光器的相关知识；分别讨论了双向单纵模环形腔激光器和多波长激光器的设计方案；系统地分析了掺杂光纤饱和吸收体中形成的动态光栅的反射谱特性。

Fiber Bragg grating is a fiber2op tic wavelength modulation device. Using fiber Bragg grating reflection of a certain wavelength which was affected by the parameters of the outside world because of the sensitive effect, a fiber grating sensorwas developed.

光纤Bragg光栅是一种波长调制型光纤器件，利用光纤Bragg光栅反射波长对某外界参量的敏感效应，可以研制出光纤光栅传感器。

It refrigerate with itself machine equipment, It can not be affected by environment climate.

它依靠自身的机械设备制冷，不受外界气候条件的影响，温度稳定，贮运效果好。

Accurate station keeping is demonstrated in experiments with our four-DOF underwater vehicle and the observed target which is a regular tetrahedron with four ball-like culminations in our indoor water tank.

悬停定位具有两个特点：首先，它是一种动力定位，即在定位传感器的引导下，依靠自身的动力，在控制系统的指挥下抵抗外界扰动而保持某一位姿；其二，它是一种局部定位，水下机器人相对作业目标的运动空间范围一般不会很大。

On the basis of their experimental data,the regularity of the factors mentionedabove were further discussed here.

但用传统的动力学方法具体描述在不同的外界因素影响下的反应过程是相当困难的。

But some dissident groups and diplomats expressed concern that the aging, hard-line generals who run Myanmar would be reluctant to ask for outside help because they are known to be secretive and xenophobic.

但是一些不同观点的组织和外交官发表了不同看法，因为缅甸的执政的老化和强硬的将军不情愿要外界的帮助，因为他们一直是秘密的和排外的。

The Jackson children reputedly have all their toys destroyed at the end of the day for fear of infection.

外界谣传说Jackson的孩子所玩的玩具因为防止细菌感染而在每天结束时被销毁。

How much will power and resoluteness does it need for one to persevere to the end of the day, all the while keeping one' body and mind intact and external distractions at bay?

要有多大的动力，多强的意志，才能支持继续地维持所设定的绝食天数，而不受到外界的干扰与身体妥协的动摇？！

But the expression of two genes was high and had obvious rhythmicity under 25LL and 20LD.In a word,after embryo nervous system has grown, the B.mori can strengthen the ability to perceive the illumination and temperature outside.

说明胚胎神经系统发育后，能够增强对外界光照和温度的感知能力，提高per基因和tim基因对授时因子的敏感性，而这两个基因对光照和温度的反应存在差异。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。