现在设想你的笔记本电脑比一个牛皮纸信封或者你手中的手机还薄。
Now think of your laptop, thinner than a brown-paper envelope, or your cellphone in the palm of your hand.
注意：如果把情书装在马尼拉纸信封（manila envelope类似于牛皮纸信封——译者注）里的话，那么就别指望你们关系会更进一步了。
WARNING- if you send a love letter in a manila envelope, expect your relationship to end soon
信封厂使用很多不同类型的纸张，从顶级的犊皮纸到牛皮纸。
Envelope factories use many different types of paper, from top quality vellum to craft paper.
信封厂使用很多不同类型的纸张，从顶级的犊皮纸到牛皮纸。
Envelope factories use many different types of paper, from top quality vellum to craft paper.
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