早产是围产期死亡的主要原因。
旧公交车是造成城市污染的主要原因。
错误的供电线路是房屋火灾的主要原因。
他说这一问题不是让他恼火的主要原因。
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.
失业是贫困的主要原因。
失业是贫穷的主要原因。
钱在许多婚姻中是导致冲突的一个主要原因。
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.
这些事故的主要原因之一是什么？
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.
这可能是我法语进步的主要原因。
他指出糖是蛀牙的主要原因。
世界杯也是造成睡眠不足的主要原因。
The World Cup is also chiefly responsible for sleep deprivation.
家长和学校是主要原因。
如今英国老年人护理危机有两个主要原因。
Today's crisis in care for older people in England has two main causes.
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.
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.
然而，由于工作时间过长而产生的精神和身体上的压力是人们对许多工作不满的主要原因。
The emotional and physical stress, however, that occurs due to hard working hours is a prime reason for a lot of the career for dissatisfaction.
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.
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.
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