夏日的快乐常常带有一种转瞬即逝的特性，这更让人珍惜每一刻。

The joy of summer often carries a sense of ___transience, making us cherish every moment more.

樱花的美提醒我们生命的短暂与无常。

The beauty of cherry blossoms reminds us of the ___transience of life.