occur to（及物，不可分）浮现在（某人）脑中
It occurred to me that we could collaborate in compiling a new dictionary.我想到我们可以合编一部新词典。
It never occurred to him that it was his bosom friend who had stolen his money.他从没想到偷他钱的竟是他的挚友。
Didn't it occur to you to close the windows？难道你没想到去关窗户吗？
open up1（及物，可分）打开（包裹、箱子等）
The pipe fitter opened up the sewer.管子工打开了下水道。
Ivar opened up the parcel.(or：Ivar opened the parcel up.)伊瓦尔把包裹打开了。
The policemen opened up a passageway through the crowd.警察从人群中打开一条通道。
open up2（及物，可分）开发
The Government has decided to open up the natural resources of mountain areas.政府已决定开发山区的自然资源。
The new railway opened up a vast region to trade.新铁路使一片广大地区通商了。
The West of China is rich in resources.Many foreign businessmen will take part in opening it up.中国西部资源丰富，许多外商将参与开发。
open up3（不及物）透露内心的思想或感情
She opened up to him.她向他敞开心扉。
He is that sort of man who doesn't easily open up in getting along with people.他是那种在待人接物方面不爱吐露真情的人。
After hours of grilling，the prisoner opened up.经过几小时的审讯，犯人开始说真话。
operate on（及物，不可分）给…动手术
He operated on the baby's throat at once and saved his life.他立刻给婴儿的咽喉动了手术，救了他的命。
The doctors decided to operate on the injured man.医生们决定给这位受伤的男子动手术。
The surgeon operated on my uncle to remove his appendix.外科医生给我叔叔做了切除阑尾的手术。
I will have to have my nose operated on next week.下周我的鼻子得开刀。