形容词平凡的，陈腐的; 平庸的，普通的
名词老生常谈; 寻常的事物; 平常话，口头禅; 备忘录
形容词
1. Some scientists believe that soon it will be commonplace for people to travel to the moon.
一些科学家相信，不用多久，人们到月球旅行会变成常见的事。
2. The fashionable remarks of today often become the commonplace expressions of tomorrow.
今天流行的时髦话明天常常成为陈腐之言。
名词
1. What he has said is a mere commonplace.
他所说的无非是老生常谈而已。
2. Jet travel is now a commonplace.
乘喷射机旅行现在是寻常的事。