The mushroom knows not the alternation of day and night. The cicada knows not the alternation of spring and autumn. These are instances of short life.
朝菌不知晦朔, 蟪蛄不知春秋, 此小年也。
Light and shade come in swift alternation; Days and months flash by as quickly as a weaver's shuttle.; Light travels like an arrow, and time like a shuttle.
光阴似箭，日月如梭。
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