A prepaid plastic recycling envelope is included in the box, making it easy to recycle your newly obsolete phone.

盒子内包含了一个预付的可回收塑料封盖，让其可方便回收你刚废弃的手机。

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There were all these problems making really large cameras and getting uniform CCDs out of companies that were already pushing the envelope.

各家公司在制造很大的相机和统一的CCD时遇到了许多难题，都已经智穷计拙了。

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I like the envelope system for making sure I don't spend too much on variable expenses.

我喜欢用信封系统，它能让我确定自己不会在一些乱七八糟的花销上浪费钱。

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"Carl was a back-of-the-envelope guy quick at making decisions, " says Miles Rubin.

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"When you do the back-of-the-envelope calculations (of all the separate groups recommended for vaccination), you are actually already making a recommendation that 75% of the population get it, " Schaffner said.

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Now, making a comparison to a mainstream commodity option requires a little work on the back of an envelope.

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