If you describe something as ephemeral, you mean that it lasts only for a very short time.
例句
He talked about the country's ephemeral unity being shattered by the defeat...他談到戰敗使得該國短暫的統一徹底破滅。These paintings are in some ways a reminder that earthly pleasures are ephemeral.這些畫在某種意義上提醒人們世俗的享樂是短暫的。
英漢詞典釋義
adj.
短暫的,瞬息的
Most newspapers are of ephemeral interest.多數報紙只能引起讀者短暫的注意。
英英詞典釋義
Adjective
1. enduring a very short time;
"the ephemeral joys of childhood""a passing fancy""youth's transient beauty""love is transitory but at is eternal""fugacious blossoms"