It is the smaller twin of the Hall of Supreme Harmony.

它是太和殿小一号的孪生弟弟。

youdao

Across this courtyard lies the Gate of Supreme Harmony. This marks the start of the Outer court proper.

穿过横卧在大院的太和门，就开始是严格意义上的外朝了。

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The emperor would arrive at the Hall of Supreme Harmony amidst ceremonial music, drum-beating and firecrackers.

皇上会在一段正式的乐曲，和炮竹击鼓声中步入太和殿。

youdao

The Hall of Supreme Harmony is the palace's biggest and most important structure.

BBC: Beijing's once Forbidden City

The Hall of Middle Harmony was a kind of backstage area where the emperor stopped to compose himself and consult with ministers before entering the Hall of Supreme Harmony.

BBC: Beijing's once Forbidden City