Strenuous ~字典上的解釋是
1. needing a olt of effort of strength
~ a strenuous climb.
~ The doctor advised Ken to avoid strenuous exercise.
2.active and determined
~ Sherry's been making a strenuous effort to lose weight.
黃石公園有好幾個瀑布，但我印象最深刻的是Lower Yellowstone Falls，從公路要走階梯下去河邊，看完氣勢磅礡的瀑布，要爬上階梯回公路，還要花很大的力氣，滿路的老外都說：strenuous.
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