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©Ò¿× 500¦~"¤@¹J"¡A§Ú²q¬O²Îp¾Ç¤¤ªº"return period" (= 500 years)¡Ai.e. "¥ô¦ó¤@¦~«×¤º, µo¥Íªº¾÷²v¬O 1/500"¡A¨Ã¤£¥Nªí¯uªºn500¦~¤~¯àµo¥Í¡C
http://en.wikipedia.org/wiki/Return_period
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