将下列英文单词或短语译成汉语: 1. Read Only Memory 2. Random Access Memory 3. explain 4. difference 5. confuse 6. stand for 7. record 8. remember 9. switch to 10. turn off 11. save 12. essential 13. change one's mind 14. alter 15. journal 16. erase 17. be good at 18. forget