open的基本意思是“开着的、开放的”，作“空旷的,开阔的”时，在句中只充当定语。作“开始营业的、(职位等)空缺的”时，在句中作表语，后面经常跟to或with短语，open在句中还可充当宾语补足语。
1.开放的；敞开的
如：A wasp flew in the open window.
一只黄蜂飞进了开着的窗子。
2.(人的眼睛、嘴等) 张开的；张着的
如：He was breathing through his open mouth.
他张着嘴呼吸。
3.展开；开放
如：The flowers are all open now.
花现在都开了。
4.畅通的
如：The pass is kept open all the year.
通道一年到头畅通无阻。
5.敞口的；未封的
如：The bag burst open and everything fell out.
袋子爆开了，里边的东西都散落出来。
6.(衣服) 没扣上的；敞开的
如：Her coat was open.
她的外衣敞着。
7.开阔的；未围上的
如：A city with a lot of parks and open spaces
有很多公园和空地的城市
8.对大众开放的；公开的；人人可以参加的
如：The debate was thrown open to the audience.
辩论会对听众开放。
9.诚恳；坦诚；直率
如：She was always open with her parents.
她总是与父母无话不谈。
