视频对话：
No, I'm gonna have to file an extension.
没有，我要申请延后缴。
You already filed an extension.
你已经申请过延期了。
Yeah, well, I gotta file another one.
是，我还要再延期一次。
That's... It's $650. I'll have it in the next month.
一共是640美元，我下个月就有了。
本期学习词汇：
file
vt.提出（离婚诉讼或其他讼案）；把……归档；发稿；
vi.发送（报道给报社）；排成一行行走；提出申请；
file away 存档（备查）； 锉掉； 锉削
file away the report 将报告归档
例句：
1. When Robert Merton invented the "Black-Scholes" formula back in the early 1970s, he never bothered to file a patent for the idea.
当罗伯特-默顿(Robert Merton)在上世纪70年代初设计出"布莱克-斯科尔斯(Black-Scholes)"模型时,根本没想过要去给这个想法申请一个专利。
2. I filed for divorce on the grounds of adultery a few months later.
几个月后我以通奸为由提起了离婚诉讼。
3. She paused as the group of children filed out of the house.
那群孩子从房子里鱼贯而出时，她停了下来。