Preach
Lecture
Expound
The president's speeches are regularly reproduced verbatim in the state-run newspapers.
Here are some others key tips based on my own speaking experience and what I've noticed in other good speakers.

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Open the tool →讲经 (jiǎng jīng) means “Preach, Lecture, Expound”.
讲经 is pronounced jiǎng jīng in Mandarin Chinese.
“Preach” is 讲经 (jiǎng jīng) in Chinese.
This page has 2 example sentences using 讲经, each with pinyin and an English translation.