1. Her open letter was really an apology for her way of life.
   她的公开信实际上是对她生活方式的辩护。
2. He ripped open the letter.
   他把信撕开了。
3. He slit open the letter with a knife.
   他用小刀把信拆开。
4. I slit open the letter with a knife.
   我用一把小刀把信裁开。
5. I open a letter of credit in Renminbi with a Bank in U.S.A.
   我在美国的一家银行开立了人民币信用证

　1个名词解释