【摘要】英语四级写作说明危害段常规写法 1)First , the travel craze puts a heavy burden on the traffic system . 首先,旅游热潮给交通系统造句成了沉重的负担。 2)Second , thousands of tourists flood into scenic spots , causing over crowdedness and safety problens . 第二,成千上万的游客涌向各个景点,带来过度拥挤和平安问题。 3)Secondly , some students rely on the reference books too much , which is unfavorable to the improvement of their ability to sork out the solutions