What are the translations of "Xin" in ancient poetry?

A sailing tourist will talk about Japan, which is hidden in water and fog and inaccessible. The first sentence of Li Bai's dream of climbing Mount Tianmu. Loyalty means certainty.

People who often talk about Tianmu Mountain at sea say that Tianmu Mountain is really hard to find because of the smog and vast waves.

"The Book of Songs Feng Wei Mang": "Laugh and curse."

Swear: a sincere oath; Danny: Sincerity. The oath is true and credible.