a vacuous look的用法和样例：
- A vacuous comment.
- Therefore, to avoid a vacuous academic talk, ethical misconduct cannot be treated with vague academic parlance.
- Rarely can such a vacuous concept have found its way into a debate claming to provide enlightenment.
- I look at this problem from a different viewpoint.
- The second was that he repeated a vacuous mantra about a strong dollar being in America's interests, even as everyone knew policymakers quietly welcomed its slide.