重点讲解：
1. step up
增加（数量等）；提高（速度、强度等）；
eg. Radio traffic has stepped up enormously.
无线电通讯已大大增加。
eg. He stepped up his donations to charity.
他加大了给慈善机构的捐赠。
2. for the first time
第一次；首次；
eg. There is no feeling on earth like winning for the first time.
初尝胜利滋味的感觉真是无可比拟。
eg. For the first time Celia de Grey hesitated.
西莉亚·德·格雷第一次显出迟疑的神色。
3. fill out
填；充实；
eg. The chief editor said they'll publish your paper if you can just fill it out a little.
主编说，只要你把论文内容稍加充实，他们就刊登。
eg. f you could take some time to fill out the survey, we'd appreciate it.
如果你能够有时间完成这份调查，我们将非常感谢。
