Because a digital signature is based on public key cryptography, it generally takes much more time to compute a digital signature than a MAC.

由于数字签名是建立在公用密钥密码术基础上的，因此计算一个数字签名所花的时间往往要比计算一个mac长得多。

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But the speed gap has narrowed considerably, and one of the Lenovos beat the Mac in restart time.

不过速度上的差距已经明显缩小，其中一部联想电脑还在重启时间上击败了Mac。

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The curtain behind us rose to reveal Fleetwood Mac singing Dont Stop Thinkin About Tomorrow one more time.

我们身后的帷幕缓缓升起，弗利特伍德麦克乐队现身，再度唱起《不要停止期盼未来》。

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Moving on, he stated that Apple's retail stores also had a record quarter (noticing a trend?), with about half of all Mac buyers in stores being first-time Mac owners.

ENGADGET: Apple reports fiscal Q4 earnings: $1.67b profit, Mac sales way up, iPod sales down, 'great new products' for 2010

But a Bloomberg story this week avers that officials who worked at Freddie Mac at the time deny having received any such advice.

ECONOMIST: After Mr Dopey and Mr (too) Friendly, Mr Grumpy gets his turn

"If all the authority were fully implemented, the federal government would directly fund, own, and lend to Fannie Mae and Freddie Mac for the first time since the companies were created, " he said in a note to clients sent out Sunday evening.

FORBES: Rescuing Fannie And Freddie