a sharp attack的用法和样例：
- He was suffering from a sharp attack of jaundice.
- In a sharp attack on Iranian leaders last Friday, former President Akbar Hashemi Rafsanjani warned those in power to "abide by the will of the people" and heal the wounds of the recent crisis.
- You need a sharp knife to cut through the knot.
- I cut my finger on a sharp stone.
- A sharp knife makes a clean cut.