A : Okay, how about a gift certificate to a bookstore? Dad loves to read. He’s a real bookworm.
B: Yeah,we already thought of that, and Aunt Linda is on the case.
A: Fine.Neckties?
B: Can you get anymore run-of-the-mill?
Translation :
A : 送书店的礼品券怎么样？爸爸喜欢读书，他是个不折不扣的书虫。
B : 嗯，我们想到过，Linda阿姨已经在准备。
B : 好吧，那领带呢？
A : 你还能再普通些吗？

1. be on the case 已经着手做
例句：Nor am I concerned that errant CEOs will escape punishment,since the feds are finally on the case. 
我也不担心犯错误的首席执行官们会逃脱惩罚，因为最终政府已经介入。 

2. run-of-the-mill  普通的；非精选的
He finally got a run-of-the-mill job.
他最后指找到份普通的差事。
He is not particularly brilliant; just run-of-the-mill. 
他并不是特别有才能，只是普普通通。 
I would rather have a pair of run-of-the-mill jeans than some of there fancy trousers that are fashionable nowadays. 
我情愿要一条普普通通的牛仔裤，也不要当今流行的那种稀奇古怪的时装裤
This is a run-of-the-mill detective story.
这是本平淡无奇的侦探小说。