New words：

engagement /ɪnˈɡeɪdʒmənt/

n. 订婚；婚约
n. 参与；投入
n. 约会；预约；事务安排

详细词源拆解：

词根：engage（v. 约定、投入、使忙碌）+ 名词后缀 -ment（表行为、状态、相关事物）。
词源本源：源自 en-（使）+ gage（承诺、契约），本义为 “定下约定”。
词义演变：订立承诺 → 婚约、约会；投入行动 → 参与、投身；事务缠身 → 工作安排、预约。

Sample Sentence

His engagement in sports keeps him strong and healthy.

I have an important engagement and cannot go out today.

Our teacher praises our full engagement in class activities.

They announced their engagement to all their close friends.

关键使用提醒

语体用法：正式词汇，书面写作、正式场景优先使用，口语多用 date/appointment

例句：His engagement in public activities is widely known.
翻译：他积极参与公共活动，这一点众人皆知。

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