退下

Is noe kind of non- reclaimable fishing tool which is normally used for the fishing purpose from the outside of the pipe string,iscan be used to fish flat-type fsh head of the pipe string.

弯鱼头打捞筒是从管柱外部进行打捞的一种，不可退式工具可打捞弯扁形鱼头的落井管柱，其特点是在不用修整鱼顶的情况下直接进行打捞。

It was done; I stirred up the ashes, and interred them under a shovelful of coals; and she mutely, and with a sense of intense injury, retired to her private apartment.

烧完了，我搅搅灰烬，用一铲子煤把这些埋起来，她一声也不吭，怀着十分委屈的心情，退到她自己的屋里，我下楼告诉我主人，小姐的急病差不多已经好了。

The problem of the Hawking evaporation of Dirac particles in general spherically symmetric and charged evaporating black hole background is thus solved.

本文对一般球对称带电蒸发黑洞中Dirac粒子的Hawking辐射进行研究。利用零标架和旋系数方法，讨论了该时空背景下Dirac方程的退耦与分离变量。

Rather than thinking about your experience as the be-all and end-all of reality, take a giant step back and see yourself and the Earth in the grand landscape of space and time, suggests Brian Greene, PhD, an expert in superstring theory (which posits that there are 10 dimensions of space).

不要把自己的体验作为现实的一切，一切的现实。退一步，看一看自我和在浩瀚时间/空间下的地球。这是超串理论（这一理论认为有10个维度的空间专家Brian Greene给人们的建议。

It's said that Sappho, the Greek female poet who was phraised as"the tenth muse", was good at playing lute, singing and dancing, and was loved by people in her road show on the Balkan Peninsula. Was she frequently dancing trippingly on the beach? Her fine feet stepped on the white silver sand, with blue thin veins appearing underneath her pale skin; and with the cerulean Aegean Sea behind her, waves beating the shore, coming forward and waning backward, helping her to keep time; her tender body looked more delicate on the magnificence background , and then her movements were frozen in the sky.

传说被誉为"第十位缪斯"的希腊女诗人萨福擅长演奏诗琴，且能歌善舞，在巴尔干半岛巡回演出时极受人们喜爱，不禁神往：她是否常翩翩起舞于沙滩之上，纤美的双足踏着洁白的细沙，甚至可以看到那从苍白皮肤下透出的蓝色的细小血管；身后就是蔚蓝的爱琴海，海浪拍打着沙滩，漫过来又退下去，为她打着拍子；她娇小的身体在宏大壮美的背景上更显秀丽，最后永远定格在天空之中。

Also, write your address in the top left-hand corner of the envelope.

写信给熟朋友时并不需要信首，可是一定要在信封上写下退件地址。

The third thermal boundary condition equation joined with the degradation rate of interior wall was used to get the contour of interior wall vs. time under the condition of identical heat flux between fluid and solid in axis direction. The numerical simulation results agrees well with that of measurements.

在气流与固壁之间的热流量沿轴向一致的条件下，通过加入降解退移速率的第三类热边界条件方程，求解出不同时间管内壁面轮廓沿轴向变化情况，模拟值与试验结果基本吻合。

And yet, I am certainly Japanese, in the sense that I stand back and 'marvel' at westerners who keep trying to define this undefinable thing called Japan.

在这个意义上，我退而为西方人试图为这种无法定义的叫日本的东西下定义感到'大为惊异'。

Mathematics model of dielectric under uniform electric field is built up, and total current is separated into three parts such as conductive current, instantaneous current and relaxation polarization current, then polarization and depolarization of linear and non-linear dielectric are simulated under step excitation, the results show that nonlinearity of non-linear conductivity is reflected by measuring surface potential attenuation during the process of self-discharge of non-linear dielectric.

论文首先对处于均匀电场下的电介质进行电路建模，把电介质的总电流分为电导电流、位移极化电流和松弛极化电流三部分来分析，然后以此为基础利用Matlab软件中的Simulink平台对直流阶跃激励下线性和非线性绝缘介质的极化和退极化过程进行了仿真，结果表明可以通过测试非线性绝缘介质自放电过程的表面电位衰减来反映其非线性电导的非线性程度信息。

If the device is deemed "unrepairable" it will be returned to you without prior notification.

如果手机被认为"不可被修理"它将在不事先通知你的情况下退还给你。

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。