tutorial资讯

更可怕的是，平均下来每位用户的搜索成本只有1-4美元！

For 4 points: 4/8=1/24/8 = 1/24/8=1/2. Exactly 50%.

，这一点在体育直播中也有详细论述

We step on to Siri, a larger "mother platform" that has a control centre manned by offshore workers.

Sound: Bang & Olufsen surround sound (4 speakers)