in vain片語KK [ɪn ven] /ɪn veɪn/發音片語1徒勞、白費、沒有結果We searched in vain for the missing keys all morning.我們找了一上午遺失的鑰匙,卻徒勞無功。2白白、枉然Their sacrifice was not in vain, because the reform finally passed.他們的犧牲並非白費,因為改革最終通過了。3不敬地、褻慢地多用於宗教語境He was taught never to take the Lord's name in vain.他從小被教導不可妄稱主的名。