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(husband and wife) earning a living together
共かせぎでないと都心のマンションは買えない。
You cannot buy an apartment in the city center without a dual income.
共かせぎの家庭では家事の分担が重要になる。
In dual-income households, dividing household chores becomes important.
最近は共かせぎの夫婦が増えてきている。
Recently, the number of dual-income couples has been increasing.