時間が経つのは早い


(How) time flies.

The Free Dictionary では
Time flies.  also How time flies!
something that you say which means that time passes very quickly, often so quickly that you are surprised I can't believe your son is at university already. How time flies! I never seem to manage to finish my work. The time just flies.
時間が飛んでく=時間が経つのは早い なるほどー




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