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once in a while; occasionally; at long intervals
時たま昔の友人と会う。
Once in a while, I meet old friends.
時たま、故郷の香りを思い出す。
Occasionally, I recall the scent of my hometown.
遠方に住む姉から、時たま手紙が届く。
From my sister who lives far away, letters occasionally arrive.