In vain什么意思

"In vain"是一個英語短語，意為「徒勞無功」、「沒有結果」或「無濟於事」。這個短語通常用來描述某人或某物的努力或嘗試沒有達到預期的結果或目的。例如：

• Despite his efforts, he failed to persuade her. His attempts were in vain.
• The soldiers fought bravely but their resistance was in vain.
• The search for the missing child was in vain; they never found him.

在這個短語中，"vain"用作副詞，意為「無用的」或「無效的」。它源自拉丁語中的"vanus"，意為「空的」或「無用的」。