Translation of "Commonplace" in Japanese

Space travel will be commonplace some time in the future.

宇宙旅行はそのうち珍しくないものになるだろう。

In my grandmother's lifetime, both telephones and computers have become commonplace.

祖母が生きているうちに、電話もコンピューターも一般的なものとなった。

For my multi-talented sister, able do anything with ease, it seems that my commonplace self is something whose existence she finds very hard to forgive.

さまざまな才能に恵まれて、なんでもそつなくこなす姉にとって、平々凡々たる俺の存在はひどく許せないものらしい。