A caustic wit的用法和样例：
- A caustic material or substance.
- With caustic wit, he made a fierce assault on the alchemists.
- He opened his mouth to make a caustic retort.
- Desmut is the opposite of a caustic solution such as lye.
- They are a less irreverent and more melodic Art Brut, swapping that band's caustic wit for a far nicer type of honesty.