单词学习：momentariness 名词（抽象概念）
momentariness
/ˈmoʊmənˌterinəs/
瞬间性；短暂性；刹那性
Mr. Gu often reminds his students to appreciate the momentariness of a beautiful sunset, as it teaches them to cherish fleeting joys.
顾老师经常提醒学生欣赏美丽日落的瞬间性，因为这教会他们珍惜转瞬即逝的快乐。
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