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1·Smoking is one of the main reasons for fires.

吸烟是导致火灾的主要原因之一。

2·The Washington Post reported, one of the main reasons, experts say, is that farmers have used herbicides on the milkweed plants that these butterflies feed on.

《华盛顿邮报》报道，专家说，主要原因之一是，农民对马利筋植物使用除草剂，而这些蝴蝶以马利筋植物为食。

3·One of the main reasons is a change of lifestyle.

其中一个主要原因是生活方式的改变。

4·Most people read for two main reasons, pleasure or knowledge.

大多数人读书主要有两个原因：乐趣或知识。

5·There are several main reasons why old buildings should be torn down and replaced by new ones.

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。

6·Two main reasons can cause poor eyesight: too much time spent indoors studying and too little time spent outdoors playing.

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。

7·Another survey gave climate conditions, homesickness, and the stark appearance of the Australian countryside as the main reasons for leaving.

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。

8·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.

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。

9·The result shows that there are two main reasons about this problem.

结果表明，造成这一问题的原因主要有两个。

10·According to recent studies, there are three main reasons that students put off doing things.

根据最近的研究，学生做事拖延主要有三个原因。