When you come to a closed door, check it with the back of your hand.

当你走到一扇关着的门前时，用手背检查一下。

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Check for wrist or finger movement, there should be none with back tension.

检查手腕或手指的活动，那不应有背部紧张的情况。

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I put a check in the envelope and taped it back to the bin.

我把一张支票放在信封里，并把它粘回垃圾箱上。

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All high schools, as opposed to just some, also will now receive their students' test scores, allowing for a "back-end check, " Ms. Rice said.

WSJ: College Tests Get New ID Standards

Sorry, we don't have pictures but Apple took us into a dramatically lit back-room to check out the new iPhone 3G.

ENGADGET: iPhone 3G hands-on Hands-on

So you have to schlep the thing back to the check-in counter and pray that you don't miss your flight.

FORBES: Fact and Comment