1·Premature birth is the main cause of perinatal mortality.
早产是围产期死亡的主要原因。
—— 《柯林斯英汉双解大词典》
2·The main cause of women's and children's oppression is patriarchy.
妇女及儿童受欺压的主要根源在于父权制度。
—— 《柯林斯英汉双解大词典》
3·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.
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。
4·Analysts say the main cause of Mexico's nosedive is that the nation's economy is tied strongly to that of the United States, which is mired in the deepest economic downturn since the 1930s.
分析师说，墨西哥经济急剧下滑的主要原因是墨西哥经济与美国紧密相连，美国目前正陷入19世纪30年代以来最严重的经济衰退。
5·It is believed that greenhouse gases are the main cause of global warming.
人们相信温室气体是全球变暖的主因。
6·These compounds are the main cause of acid rain.
这些混合物是酸雨的主要成因。
7·Obesity does not seem to be the main cause either.
肥胖症似乎也不是主要起因。
8·The main cause: the growth in the number of researchers.
造成这种局面的主要原因：研究人员数量的增加。
9·We know greenhouse gases are the main cause of warming
我们知道温室气体是暖化主因
10·Flying debris is the main cause of broken Windows in tornadoes.
在龙卷风中，飞扬的瓦砾残片是打碎窗户的主要原因。