Firstly, ambition plays an essential role because it serves as a driving force for people to achieve success.
首先，志向起着至关重要的作用，因为它是人们取得成功的动力源泉。
Firstly, food is often thrown away before it reaches customers because too much of it is produced.
首先，食物经常在到达顾客之前就被扔掉，因为生产的食物太多了。
Firstly, many truck drivers are forced to drive days and nights with little rest simply because their employers desire more profit.
首先，很多卡车驾驶员被迫日夜不停地驾驶，因为他们的雇主想赚更多的利润。 第二，许多市民在酒后驾驶，一旦发生紧急情况他们的反应会比较迟缓。
"It is one of those issues which can articulate the middle class, " he said. "Firstly because once you've got a certain level of prosperity, concern about the environment becomes greater.
拉纳·米特指出环境可能是一个争拗点.他说:「这是一个能够团结中产阶级的议题之一.首先当你们一旦得到一定水平的富足,便加强对环境的关注.第二,因为有一个拥有财富的中产阶级,他们变得更加关心自身利益.任何稍为偏颇的方向都可能带来麻烦,也许是一个提示.」
Firstly because there is a lot of things to see and to photograph (monuments, people, everyday scenes of life...) and secondly because my camera does not attract the attention of thieves.
在巴黎，要看的东西实在太多了（纪念碑，行人，日常生活）。 还有啊，我的相机也不会引来贼的注意。
Firstly , overnight work is dangerous because it disrupts the circadian rhythm, the body's biological clock. The hormone melatonin, which can suppress tumor development, is normally produced at night.
首先，通宵工作是危险的，因为它打乱了生理节奏，身体的生物钟，可以阻止肿瘤生长的黑色素，通常是在晚上产生的。
Firstly, television is watched by babies, partly because parents park them in front of it and partly because even babies perceive a need for t.v. to combat boredom.
首先，婴儿看电视的部分原因是父母将他们放在电视机前。
They are angry with me firstly because I went to the United States, secondly because I didn't come back after the war and thirdly because I came back.
他们生我的气，第一是因为我去了美国，第二是因为战后没有回国，最后是因为我后来又回来了。
After all, we are very lucky, firstly because we're very healthy but also because we do what we love which is playing football.
我们很走运，首先我们很健康，但也因为我们从事的是自己最热爱的足球事业。
Firstly, we don't have to do many things personally, because we have robots to finish them for us.
首先，我们不用亲自去做很多事情，因为会有机器人替我们完成。
Fred: Firstly, it is convenient. And secondly, it has low cost, because you know you only need to pay the fee of Internet service.
佛瑞德：第一点，那就是方便第二点则是它的成本比较低，你知道只需付网费就够了，网费很便宜。
Fred: : Firstly, it is convenient. And secondly, it has low cost, because you know you only need to pay the fee of Internet service.
佛瑞德：第一点，那就是方便第二点则是它的成本比较低，你知道只需付网费就够了，网费很便宜。
In stabilizing and tracking system of optoelectronic platform, a stabilizing control loop must be designed firstly because of various external disturbances.
机载光电平台稳定与跟踪系统由于受到外部各种干扰的影响，需要首先建立一个稳定控制回路。
Firstly, it is important that clinicians understand what recommendations are supported by the highest level of evidence because these will be recommendations that they can feel fully confident about.
首先，临床医生理解最高级别的证据支持指南推荐的是什么是非常重要的，因为这样他们就能够有充分的信心被建议。
Firstly, because of the new international trade environment and anti-dumping system characteristics the legal and effective anti-dumping measure is widely used in the whole world.
首先新的国际贸易环境和反倾销自身制度特点导致反倾销这一合法有效的非关税手段被广泛的应用。
Firstly because running is a single-plane activity – it only uses the body in one direction and uses a limited number of muscle groups at a time.
首先，由于跑步是一种单一水平运动，它只运用了身体的同一方向趋势和在同一时间只活动了有限的肌肉群。
Pong:of course, firstly, because I like, and in addition, I can have good income(laugh).
首先是因为喜欢，而且收入也不错（笑）。
Of course I would be sorry to leave London, firstly because of my family, who have already made a new life here.
当然离开伦敦我感到遗憾，首先因为我的家庭，他们在这儿为我开创了新生活。
The working principle and characters of heat pipe are discussed in the paper firstly, because the applications of heat pipe base on them.
本文首先论述了热管的工作原理和特性，热管的应用是以此为基础的。
Because the parallel robot is hard to real-time control in terms of the complication of its dynamics, controller without considering parallel robot's dynamics is studied firstly.
鉴于并联机器人的动力学计算复杂，不利于实时控制等特性，本文首先在不考虑并联机器人动力学的情况下，研究了并联机器人的控制器设计。
By adopting the technical scheme, when the pen falls down, a pen head can not touch the ground firstly because the pen head is relatively light, therefore, the pen head is protected.
采用以上技术方案后，当笔往下掉时，笔头由于较轻，不会先着地，这样就保护了笔头。
By adopting the technical scheme, when the pen falls down, a pen head can not touch the ground firstly because the pen head is relatively light, therefore, the pen head is protected.
采用以上技术方案后，当笔往下掉时，笔头由于较轻，不会先着地，这样就保护了笔头。
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