某仓库近期有8400见计算机显示器到库，单件外形尺寸为：60cm*60cm*60cm，重50公斤

平层放1400台*6层=8400台;
1400台*(0.6*0.6)平方/台=504平方
仓库的面积利用率是:504/650=77.5%

有效容积至少应有:650*7*0.6=273立方(准备顶层有一层空位保证存取有效)

求英语大神帮忙编一段关于网上购物利弊的情景对话，是两人形式的，谢啦。

Amy: Hi, John! Your new hat is quite cool! Where did you got it?
John: Thank you! I bought it from the Internet with 30% off the price.
Amy: Really? You are so lucky! Buying things on the Internet can be quite economic. But are you sure that your hat wirth that much?
John: Why do you say so？
Amy: Well, your forehead is a little blue. I think the color comes from your hat.
John: Oh, my god!
Amy: Sometimes things from the Internet can be of bad quality. You must be careful next time.
John: Yes, you are right. Luckily, I can connect with the seller and get my money back. The Internet will always be there.