OMG!美语 Optimal Time!
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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.