PSTN signaling USES tones generated by the phone to begin or end a call.

PSTN信令通过使用手机产生的声调来开始或结束通话。

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The world of handheld computing doesn't begin or end with graphic interfaces.

手持计算的世界不只是开始和结束于图形界面。

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I did not know how to begin or end a letter, or anything at all about it.

那时我既不知一封信怎样开头，也不知怎样收尾，一点也不知道怎么写。

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Begin or end the day with a glass of bubbly or Pinot at Artesa Winery, southwest of Napa.

BBC: Mini guide to California's wineries

The red-carpet treatment didn't begin or end with the trial.

CENTERFORSECURITYPOLICY: Gitmo does not cause terrorism

The new rule, which came into force in January, means that all airlines have to add up greenhouse gas emissions from flights that begin or end at EU airports, and must pay a small charge, or trade carbon permits on the EU emission trading scheme, if they exceed their allowance.

BBC: Time to change Heathrow runway policy, says Tim Yeo