ace of aces的用法和样例：
- Known as the “ace of aces” for shooting down dozens of German enemy planes, Rickenbacker took command of the squadron soon after morale hit its lowest ebb.
- The child came within an ace of being drowned.
- The girl came within an ace of being drowned.
- Amino acid analysis of ACE inhibitory peptides.
- I've got a couple of aces up my sleeve.