1) 翻译：去国外度假已经变得越来越平常。

Taking a holiday overseas has become increasingly commonplace.

2) It is commonplace for some couples to decide not to have a baby.

3) 其他搭配：

[搭配]VERBS

be, seem 平凡；似乎平凡

become 变得平凡

regard sth as 认为…很普通

Such actions were regarded as commonplace during the war.

这样的行为被认为是战争期间常有的事。

[搭配]ADV.

very 非常普通

almost 几近寻常

enough, fairly, quite, rather 十分平常；相当普通

Her situation sounded commonplace enough.

她的情况听起来很一般。

[搭配]PREP.

among/amongst 在…中间很平常

These ideas are commonplace among teenagers.

这些观念在十几岁的人中间很常见。