今天我们来看看@Lucky小琼子 提的话题：Travel English

optimal time 最佳时间

I'm planning my Spring Festival vacation. What's the optimal time to buy a plane ticket?

我在准备我的春节旅游。什么时候买机票最好？

cheap flight tickets 便宜的机票

There is a rumor that the best time to buy cheap flight tickets is on Tuesday.