错误的供电线路是房屋火灾的主要原因。
年轻人离开农村的主要原因之一是缺乏机会。
One of the main causes of young people moving away from the countryside is lack of opportunity.
旧建筑物应该被拆除并被新建筑物取代，这有几个主要原因。
There are several main reasons why old buildings should be torn down and replaced by new ones.
一份报告称，羊年是2015年新生儿出生率低的主要原因。
The Year of the Goat was the main reason for the low newborns in 2015, a report said.
他指出糖是导致蛀牙的主要原因，尤其是糖果、蛋糕和软饮中的糖。
He pointed out that sugar is a major agent in dental decay, particularly the sugar in sweets, cakes, and soft drinks.
地理信息的存储是1830年皇家地理学会（RGS）成立的主要原因之一。
The storage of geographical information was one of the main rationales for the foundation of the RGS in 1830.
城市居民每天通勤的主要原因不仅是工作，还包括学习、商务、购物和社交生活。
The main reasons for city dwellers to commute on a daily basis is not just for work but also for study, business, shopping and their social life.
这次锐减是美国鱼类和野生动物管理局决定正式将这种鸟列为濒危物种的主要原因。
The crash was a major reason the U.S. Fish and Wildlife Service decided to formally list the bird as threatened.
另一项调查将气候条件、乡愁和“澳大利亚乡村荒凉的面貌”作为离开的主要原因。
Another survey gave climate conditions, homesickness, and "the stark appearance of the Australian countryside" as the main reasons for leaving.
早在2013年，开车时发短信就已上榜成为导致美国年轻人因交通事故死亡的主要原因。
Texting while driving was listed as a major cause of road deaths among young Americans back in 2013.
他指出，只有相对于初始的背景条件，才有可能将特定因素确定为特定历史事件的主要原因。
He points out that it is possible to identify specific factors as the primary causes of a particular historical event only relative to an initial set of background conditions.
巧克力短缺的主要原因有两个——巧克力越来越受欢迎，以及制作巧克力的植物可可产量减少。
There are two main causes of the chocolate shortage—chocolate's growing popularity and less production of cocoa, the plant from which chocolate is made.
如果我们将这一时期的通过税收来支持军事作为背景条件，那么我们就会看到英国人自己的失败反倒是造成反抗的主要原因。
If instead we regard the financing of warfare by taxation in this period as a background condition, then we will see the English reverse themselves as the main cause of the revolt.
经过生物工程改造的棉花种植场可以生产自己的抗棉铃虫杀虫剂，而棉铃虫是造成农作物歉收的主要原因，直到今年，棉铃虫的危害都很小。
Plantings of cotton bioengineered to produce its own insecticide against bollworms, a major cause of crop failure, sustained little bollworm damage until this year.
他们把共和党选民的大批离弃主要原因归咎于他的提议。
They blamed his proposal for much of the mass desertion by the Republican electorate.
吸烟是导致火灾的主要原因之一。
行星构成成分的不同是造成密度差异的主要原因。
Variations in the composition of the planets are largely responsible for the density differences.
联合国表示，人类活动是造成这一现象的主要原因。
Human activity is the main reason for this, the United Nations (UN) said.
反对者称广场舞带来的噪音是他们反对广场舞的主要原因。
Haters say the noise caused by square dancing is the main reason why they are against it.
纳多说，糖和加工食品是儿童糖尿病的发病率上升的主要原因。
Nadeau says sugar and processed foods are big contributors to the rising diabetes rates among children.
悲伤是我们哭泣的主要原因，但事实上，人们流泪后会感觉更快乐。
Sadness is our primary association with crying, but the fact is that people report feeling happier after crying.
当然，侵蚀是造成其破坏的主要原因之一，但人类活动应承担的责任也越来越大。
Erosion, of course, is one of the key reasons for its destruction, but human activity is also increasingly responsible.
导致视力下降的主要原因有两个：花在室内学习的时间太多，花在户外玩耍的时间太少。
Two main reasons can cause poor eyesight: too much time spent indoors studying and too little time spent outdoors playing.
如果气候变化才是森林火灾日益严重的主要原因，那么清除灌木丛本身是没有多大帮助的。
Clearing bush by itself won't help much if changes in climate are largely responsible for increasingly severe forest fires.
第二种，更有可能的解释是，古埃及极端干燥的气候是主要原因，因为干燥促进了有机遗骸的保存。
A second, more likely, explanation is that the extremely dry climate of ancient Egypt was largely responsible, given that dryness promotes the preservation of organic remains generally.
公共交通工具的便利将鼓励通勤者不使用他们自己的汽车，使用自己的汽车是许多城市交通拥堵的主要原因。
The convenience of public conveyance would encourage commuters not to use their cars, which is the primary reason for bad traffic in many cities.
这种细菌——存在于泥土和水中，而非粪便——是造成“游泳耳”的主要原因，症状是耳朵发痒疼痛和红肿。
This germ—which is present in soil and water, not feces—is responsible for "swimmers ear", an itchy or painful inflammation of the ear.
这些政策分析人士认为，造成这一问题的主要原因并不是工资不平等，而是低工资加上单亲家庭，并且不分性别。
These policy analysts believe that the problem is not caused primarily by wage inequity but rather by low wages coupled with single parent hood, regardless of sex.
这些政策分析人士认为，造成这一问题的主要原因并不是工资不平等，而是低工资加上单亲家庭，并且不分性别。
These policy analysts believe that the problem is not caused primarily by wage inequity but rather by low wages coupled with single parent hood, regardless of sex.
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