a sneak attack的用法和样例：
- Affected by the bad weather, our army has lost the best chance to have a sneak attack on the enemy.
- Anytime an ironclad mauler is hit by a critical hit or a sneak attack,it has a 25% chance to resist the extra damage.
- The British had attempted to end the siege with a sneak attack on Pontiac's encampment, but their plan was betrayed to the rebel leader.
- The soulknife can make a sneak attack with a thrown mind-blade (within 30 feet) and can use the blade in conjunction with other special abilities (such as imbedding a power in it).
- After a sneak preview of the film they decided to shelve it.