BGM of the Dong Zhuo trailer is another Chinese poem.

[猿神擁躉]

Which is directly derived from RoTK novel, chapter 4.
Lyrics(poem):
董賊潛懷廢立圖，
漢家宗社委丘墟。
滿朝臣宰皆囊括，
惟有丁公是丈夫`.

Translations:
The rebel Dong Zhuo conceived the foul design,
To thrust the King aside and wrong his line.
With folded arms the courtiers stood, save one,
Ding Guan, who dared to cry that wrong was done.

https://www.threekingdoms.com/004.htm
https://youtu.be/jj_VMvsG7G0

These are the previous ones, all Chinese poems as well.
Cao Cao trailer(Poem:蒿里行)
https://steamcommunity.com/app/779340/discussions/0/1694923613861779902/
Sun Jian trailer(Poem:臨江仙)
https://steamcommunity.com/app/779340/discussions/0/1744469130478786998/
Announcement trailer(Poem:十五從軍征)
https://steamcommunity.com/app/779340/discussions/0/1635237606658043345/

[The Former]

Oh, cool! I hadn't realized! It's nice they went that far, it shows they're really dedicated to presenting us with the cultural aspects of the period. I'm hoping the game will give me more new things like this that I can follow to learn more about China's history. I'm pretty sure no other country in the world has such a deep, storied past.

[98.7]

Thanks OP. I really like Cao Cao's poem...

[猿神擁躉]

No problem. Cao Cao is actually good poet, his sons are even greater. However, his most famous poem is not 蒿里行 but "短歌行Short Song Style"(wrote right before Battle of Red Cliff), Chinese students still learn his works in schools.

These poems in other trailers also are still taught in Chinese high schools.

[Remosu37]

My favorite is Cao Zhi's poem

煮豆燃豆 、豆在釜中泣、本是同根生、相煎何太急

Cao Pi succeeds Cao Cao as King of Wei, but he suspects his talented younger brother, Cao Zhi, of plotting against him.

Cao Pi accuses Cao Zhi of exaggerating his poetic ability, and demands Cao Zhi craft a poem on the spot about siblings, without using the word siblings or brothers, on penalty of death.

Without missing a beat, Cao Zhi says

Cooking beans on a fire of beanstalks,
煮豆燃豆萁，

The beans weep in the pot.
豆在釜中泣。

Born of the same roots,
本是同根生，

Why the eagerness to destroy one another?
相煎何太急?

[猿神擁躉]

Originally posted by Remosu37:

My favorite is Cao Zhi's poem
煮豆燃豆 、豆在釜中泣、本是同根生、相煎何太急

Cao Pi succeeds Cao Cao as King of Wei, but he suspects his talented younger brother, Cao Zhi, of plotting against him.

Cao Pi accuses Cao Zhi of exaggerating his poetic ability, and demands Cao Zhi craft a poem on the spot about siblings, without using the word siblings or brothers, on penalty of death.

Without missing a beat, Cao Zhi says

Cooking beans on a fire of beanstalks,
煮豆燃豆萁，

The beans weep in the pot.
豆在釜中泣。

Born of the same roots,
本是同根生，

Why the eagerness to destroy one another?
相煎何太急?

Oh Yes, this is one of most famous poems and anecdote about them. It becomes idioms such as 七步成詩(describe a person has outstanding eloquence) and 煮豆燃萁(describe siblings hurting each others).