单词：to no avail
to no avail的用法和样例：
例句
- His intervention was of no avail.他的调停无效。
- His claim to ownership is invalid.他的所有权是无效的。
- This is a subject into which many scientists have researched with no result.这是一个虽经很多科学家研究过但尚无结果的课题。
- Seven patients had abnormal urinalysis but no positive finding in culture.七位病人之尿液常规检查显示白血球增多但培养无结果。
- aimless无目的的
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