| 词组 | optimistic |
| 释义 | 后面常跟介词 about 或从句: I am very optimistic about the suc- cess of the test. I am very optimistic that the test will be successful. optional “( 大学的 ) 选修课”可以说 optional course 或 elective course 等，后者比前者常用: choose a two-hour elective course. Optional courses are updated an- nually. |
| 随便看 |
英语用法大全包含3679条英语用法指南，基本涵盖了全部常用英文词汇及语法点的翻译及用法，是英语学习的有利工具。