To inherit from the past and usher in the future; to serve as a link between the preceding and the following.
承接上面的，引起下面的。多用在写文章方面。
宋·张炎《词源·制曲》思量头如何起，尾如何结，方始选韵，而后述曲，最是过片不要断了曲意，须要承上启下。”
This paragraph serves to承上启下, connecting the introduction to the main argument.
Learn the next connected idiom: 承上启下 (chéng shàng qǐ xià) → 下落不明 (xià luò bù míng)
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