for vain的用法和樣例：
例句
- She gave her motherly love to Ciri - the child destined for Geralt by the Law of Surprise.
她秘密而徒勞地尋求恢復生育能力的方法。 - For the past year the government had kept up a dialogue with Reinado, in a vain effort to persuade him to disarm and face the courts.
去年一年政府一直保持與雷納多的對話，徒勞地想要說服他解除武裝並接受法庭審判。 - They made vain attempts to reach the mountaintop.
他們幾次徒然嘗試想攀登山頂。 - I will lose no time in vain regret.
我不會在徒然的後悔中失去時間。
