老师布置家庭作业时，学生们通常感觉做作业是一种义务。
When teachers assign homework, students usually feel an obligation to do it.
如果你希望建立一种新的关系，开始时就要小心缓慢行事。
If you are hoping to form a new relationship tread carefully and slowly to begin with.
在他回忆早年的家族企业时，他的声音里带有一种确定无疑的怀旧语气。
There is an unmistakable note of nostalgia in his voice when he looks back on the early years of the family business.
他们在看别人受罪时显然得到一种病态的快感。
They clearly take a perverted delight in watching others suffer.
再次说话时他换了一种更愿和解的口气。
该疾病的一种极其致命形式在比利时出现。
飞行在1000英尺的高度时，他听到了来自旋翼的一种奇怪噪音。
Flying at 1,000 ft., he heard a peculiar noise from the rotors.
该公司提供一种聚苯乙烯泡沫塑料垫层用来在装运时保护牌匾。
The company provides a styrofoam cushion to protect the tablets during shipping.
首先，这些武器应当只在遭受核袭击后反击时才使用。其次，这些武器的拥有必须是一种临时的应急手段。
First, the weapons should be intended for use only in retaliation after a nuclear attack. Second, the possession of the weapons must be a temporary expedient.
骑自行车运动时户外运动的一种。
研究人员认为，一种解释是，学业需求上升时，与朋友的联系就会被打断。
Researchers think that one explanation is that ties to friends are broken while academic demands are rising.
卡尔31岁时被诊断出患有一种罕见的癌症，她的肝脏和肺部长了肿瘤。
Ms. Carr was 31 when she was diagnosed with a rare form of cancer that had generated tumors on her liver and lungs.
一种相互作用且复杂的现象是波浪形成时发生的风向水的动量传递。
An interacting—and complicating—phenomenon is wind-to-water transfer of momentum that occurs when waves are formed.
科林平时发脾气时所表现出的力量，现在以一种新的方式在他体内聚集。
The strength which Colin usually threw into his tantrums rushed through him now in a new way.
这个法案将在你意识到这是一种白痴的闹剧时土崩瓦解。
It's when you realize this is the sort of idiocy farce that this law falls apart.
有一种很强大的初动力——比恒定状态时的力要大五倍。
There was a huge initial force—five times larger than the steady state force.
他还以一种非正统的方式使用滑雪杖，就是在滑雪时用它推动自己。
He also used ski poles in an unorthodox way—to propel himself as he skied.
有时当你服用一种普通药物时，可能会有副作用。
Sometimes when you take a common drug, you may have a side effect.
13岁时，我发明了一种改变我生活的东西。
At the age of 13, I invented something that changed my life.
当我了解到 Filaflex（一种新型的印刷材料）时，突破就来了。
The breakthrough came when I was introduced to Filaflex, which is a new kind of printing material.
当人们保持谦逊、尊重多样性时，就会产生一种激励效应。
There is a stimulative effect that kicks in when people stay humble and respect diversity.
这是一项艰苦的工作，但当你阅读时，你会发现曾经被视为一种义务的事情现在变成了一种乐趣。
It's hard work, but while you are reading, you'll find that what once seemed like a duty is now a pleasure.
当彭伯顿发明他的饮料时，它代表了一种持续的趋势。
When Pemberton created his drink, it represented an ongoing trend.
当且仅当这些行为发生时，在上级和下级之间才存在一种权威关系。
When, and only when, these behaviors occur, does an authority relationship exist between the superior and subordinate.
在计划改变能源系统时，我们必须考虑的另一种动力是人力资源动力。
Another type of momentum we have to think about when planning for changes in our energy systems is labor-pool momentum.
一种掠食动物经常大量捕食单单一种猎物时，这两个物种是紧密联系的。
When a predator always eats huge numbers of a single prey, the two species are strongly linked.
他们培育出了一种特殊的鸡，这种鸡下蛋时体内含有药物。
They have developed special chickens that lay eggs with drugs inside.
感知是一种能力，当我们通过感官接收信息时，它允许我们处理当下的信息。
Perception is the faculty that allows us to process information in the present as we take it in via our senses.
当你试图改变别人的想法时，试着把它作为一种对话而不是一种争论。
When you are trying to change someone's mind, try to keep it as a conversation and not an argument.
骑自行车时一种很好的运动，而且，还不污染空气。
Bicycling is good exercise; besides, it does not pollute the air.
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