Life on earth is like a fleeting mayfly.
地球上的生命如同转瞬即逝的蜉蝣。
该句使用明喻结构将人生与蜉蝣进行对比，突出生命的短暂性。
"Everything in life is as fleeting as passing clouds."
"Life is unpredictable and eventually fades away."
"Life is full of unknowns; a sunny sky can turn into a drizzle in an instant."
"Life is never smooth, wealth is not guaranteed, and relationships may not last forever."
"Life has no eternal sorrow."