没规则说明每轮只有1次偷袭呀...
要是那样双武/弓贼还怎么混
FAQ上有说...... 
而且说得很清楚......
AD把话说明白,我怎么把你的话理解为FAQ上有说一轮只能一次偷袭……
If a rogue gets multiple attacks in a round (such as from
a high base attack bonus or the Rapid Shot feat), can she
make sneak attacks for all of them?
Yes, but only if each attack meets a requirement to be a
sneak attack. For instance, a rogue who flanks an enemy can
deliver a sneak attack with every melee attack she makes. A
rogue under the effect of a greater invisibility spell treats every
attack as a sneak attack, since she remains invisible despite
attacking.
If later attacks in a round no longer meet any requirement
to be a sneak attack, they aren’t sneak attacks. For example, a
rogue under the effect of an invisibility spell would deal sneak
attack damage only with her first attack in a round, because she
turns visible as soon as she makes the attack.
这样的...不是说一轮只有一次偷袭......不过好像我确实没把话说清楚, 抱歉抱歉