It's not uncommon to come across people debating how many cups of coffee are too many, but we tea drinkers are often left to our own devices, pouring one mug after the other in reckless abandon.

人们常常争论喝多少杯咖啡算多，但我们这些喝茶的人往往自得其乐，毫无节制地一杯接一杯地倒茶。

例如：

• It's not uncommon to feel nervous before a big presentation.（在重要演讲前感到紧张并不罕见。）
• It's not uncommon to see people jogging in the park early in the morning.（清晨在公园里看到人们跑步并不罕见。）

这个表达通常用于消除某种现象或行为的不寻常感，让听者明白它在某些情境下是可以接受的或常见的。