a groundless accusation的用法和样例：
- The reasoning it stated was unfounded and exaggerated, it is a groundless accusation.
- Legal skill: In order to whitewash the criminals' crime, unjust trial and decision is made against a groundless accusation, destroying the victims (witnesses) in legal form.
- Their groundless accusation is made with ulterior motives.
- This is a groundless, vicious slander and a grave calumny on the Chinese people and Chinese scientists.