失业是贫困的主要原因。
失业是贫穷的主要原因。
早产是围产期死亡的主要原因。
钱在许多婚姻中是导致冲突的一个主要原因。
跳过它的主要原因是时间不足。
错误的供电线路是房屋火灾的主要原因。
交通事故是旅行者死亡的主要原因。
Traffic accidents are the major cause of death among travelers.
其中一个主要原因是生活方式的改变。
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.
这可能是我法语进步的主要原因。
主要原因是美国的学校往往不考虑向国外寻找校长。
The chief reason is that American schools don't tend to seriously consider looking abroad.
日本表示，对疾病的恐惧是其阻止生鲜进口的主要原因。
Japan says fear of disease is its main reason to block fresh imports.
旧公交车是造成城市污染的主要原因。
他对语言的误解是他其他问题的主要原因。
His misunderstanding of language was the primary cause of his other problems.
对不起，我的任务没完成。主要原因是我这星期有许多其他工作要做。
I'm sorry my assignment isn't finished. The thing is, I've had a lot of other work this week.
我订阅《新科学家》的主要原因是要跟上科学的进步。
My main reason for subscribing to New Scientist is to keep abreast of advances in science.
政治职业化是导致我们这些弊端的一个主要原因。
The professionalization of politics is a major source of our ills.
下雨是这次飞行表演观众数量下降的主要原因。
Rain played a big part in the air show's drop in attendance.
他指出糖是蛀牙的主要原因。
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.
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.
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.
这种增长的主要原因是人们熟知的“旺季收获管理”。
The primary reason for such increases is what is known as "In-Season Abundance-Based Management".
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.
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.
在雅典，尸体埋葬三年后就要被挖出的主要原因是用地不足。
Lack of space in Athens is the main reason why the dead are dug up after three years.
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.
她在职业生涯中期重返学术界的主要原因是有更多的自由来选择研究课题。
Her main reason for returning to academia mid-career was to take advantage of the greater freedom to choose research questions.
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.
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.
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