球王的二发同样使人心惊胆颤，所以在一发失误后，他的对手也木有丝毫懈怠的机会。
His second serve was also the most feared on the circuit, so opponents had little respite even when he missed his first delivery.
最大的失误之一发生在去年，当时Facebook宣布了代号“灯塔（Beacon）”的计划，将其用户的在线购买信息发送给他们的朋友。
One of the biggest pitfalls came late last year, when Facebook announced an advertising program called Beacon that broadcast news of users' online purchases to their friends.
其不足之处在于内角赢球率和一发赢球率偏低.2。我国网球选手在接发球上直接得分率和非受迫性失误都优于对手。
The inadequacy of the interior angle win rate and the low rate in one win. 2. Tennis players in China to directly serve scoring rate and the rate of loss of direct superior opponents.
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