帮我讲一下这两句的英语语法
1 .We should always bear in mind that if we are ignorant of our health for promotion,disease will gradually approach us with the help of tiredness.
我们应该牢记：如果我们为了晋升而忽略了我们的健康,疾病便会借助疲劳乘虚而入.
2.I looked for the history book because I wanted to find out when America was founded,and at last I found the dusty book in a dim room.
我当时在找一本历史书,因为我想知道美国是何时建立的,最终我在一间昏暗的房间里找到这本布满灰尘的书.