While other styles like the breaststroke, front crawl, or backstroke can be swum easily even by beginners, the butterfly is a more difficult stroke that requires good technique to be feasible.

In dozens of experiments, scientists have shown that mixing related skills in a single practice session-new material and old, scales and improvisation, crawl and backstroke-seems to sharpen each skill more quickly than if practiced repeatedly on its own.

科学家在数十项实验中证明，相比于重复地练习某种单一技能，将相关的技能——如新内容和老内容、音阶和即兴演奏、自由泳和仰泳——融入同一个练习环节中，似乎能更快地增强其中涉及的各种技能。

Champion swimmers do not illustrate swimming in an exaggerated long, thin, on the side position in either crawl or backstroke.

游泳冠军们不会在爬泳和仰泳的一侧位置时使用夸张的长的，细的身体姿势。

The principal swimming strokes are the crawl, backstroke, breaststroke and butterfly.

主要游泳姿式有爬泳、仰泳、蛙泳和蝶泳。

The design basis of model is similarity theory, the model adopt aluminum alloy and steel structure in place of the concrete of actual bridge, backstay cable of model and actual bridge adopt the same material& reinforcing wire.

模型以相似理论为设计基础，采用铝合金和钢结构来代替原桥的混凝土材料，模型斜拉索采用和实桥同样的材料&高强钢丝制作。

The utility model relates to an adhesive tape dispenser with a function of avoiding the backspin of adhesive tape rolls.

一种具有避免胶带卷逆转功能的胶带施用器，包含有：一壳体；

Delete-backspace and erase one character or number entry

Delete-退后一格并删除一条字符或数字项

Match a backspace if in character matching mode.

比赛一退格如果在字符匹配模式。

The paper briefly introduces absolute calibration methods of sea surface height and backscatter of satellite altimeter.

介绍了卫星高度计定标中海面高度和后向散射系数的定标方法。

The effects to height evaluation of the main noises, i.e. ocean surface backscatter speckle noise and receiver thermal noise, are analyzed. By analyzing the returned signals of several typical sea states, the results have shown that the system height measurement precision can be ± 2cm.

分析了主要噪声，即海面斑点噪声和接收机热噪声对高度估值的影响，通过对几种典型海况海面回波的模拟分析表明，系统则高精度可达±2cm。

There are a lot of reasons of this phenomenon, in compliance with management system, put one's back into the mechanism, overall economic development level low, subjectively despise to management etc.

造成这一现象的原因有很多，如管理体制，投入机制，总体经济发展水平低下，人们主观上对管理的轻视等等。

The egg can put on one of mouse's back, and the other mouse hand it.

一只老鼠驼着鸡蛋，另一只扶着，他们就可以越过门槛了。

Hump suggests that the load is heavy and difficult to move and is carried on one's back or shoulders hump

指以背或扛的方式移动笨重而难以移动之物

Or do you need to take a couple of minutes to whip it back into shape?

还是需要你整理几分钟后，才能恢复原本的形状？

Then as the neck began to compress, the force of the blow caused it to whip back to the right.

接着颈部开始弯曲，最后这一下击打的力度才让头部向右移动。

Further than before from the inside story, he nonetheless remained a backroom boy in a sense, beavering away in the upper chamber and on official commissions to review such hard-to-sort subjects as electoral reform and social care for the elderly.

故事以往不曾有的是，他却在某种意义上一直处在幕后，为上议院和官方委员会辛勤的工作，回顾那些难以排序的事件（比如选举改革，或是老年人的社会福利）。

He was simply a clever backroom boy who got lucky.

他不过是个聪明的幕后工作者得到了命运之神的眷顾。

Full venting of the nitrogen in the system is important for preventing liquid hammering with the reactor backpressure valve placed in operation.

系统中氮气满管很重要，因为这防止当反应器止回阀处于运行时造成的水锤（现象）。

Software development of performance calculation for minitype backpressure type steam turbine

小型背压式汽轮机性能计算软件开发

Build a new backpressure turbine to pull one DN1600 burning sulfur blower, worked low-pressure steam is used for sale.

新上一台背压汽轮机拖动一台DN1600焚硫送风机，做功后的低压蒸汽外售。

The possibility of increasing electricity output with alkali recovery boiler a comparison between backpressure turbine and condensing turbine

用碱回收炉增加电产量的可能性&用多种工艺参数比较背压汽轮机和冷凝汽轮机