ephemeral

夏日午后的阵雨美丽却短暂，转瞬即逝。

The summer afternoon shower is beautiful but ___ephemeral, disappearing quickly.

那道短暂的彩虹只出现了几分钟就被灰暗的云层吞没了。

The ___ephemeral rainbow appeared for just a few minutes before the grey clouds swallowed it.

这位音乐家明白名声是短暂的，因此非常谨慎地打理自己的收入。

The musician understood that fame was ___ephemeral and invested his earnings with great care.