The weather is extremely cold. What do you mean?

Go deep into the bone marrow [incarnation]

Meaning: deep into the bone marrow, the metaphor is extremely deep.

Source: Song Xiangzi's "Picking Mulberry Seeds": People are like spring willows, biting bones. Take off your body gently. I'm still passionate about it.

Down to the Bone

cold

Meaning: The learning environment is hard.

Source: cold, frozen. -Xu Shen's Shuowen in the Eastern Han Dynasty

A feeling that people can feel but can't see.

Extended data:

Biting the bone produces cold, which is synonymous with biting the bone produces cold.

The cold wind penetrates one's bones.

Meaning: The weather is cold, and the cold wind seems to blow into people's skin, reaching the bones and causing stinging.

Source: Dai Fugu's poem "Drinking": "Cloth clothes don't change Gong Jin robes, which is biting and cold."

The cold wind means the weather is cold, and the cold wind seems to blow into people's skin, reaching the bones and causing stinging.

Count nine cold days [sh ǔ ji ǔ hanting]

Meaning: From the solstice of winter, every nine days is a "nine", and March 9 and April 9 are the coldest. The coldest day.

Source: Liu Hulan Act I: "It's cold and snowy on March 9, although it's cold and hot."

The coldest day.

Cold lips and teeth [chún wáng chǐ hán]?

Meaning: no lips, cold teeth.

Source: "Zuo Zhuan Xi Gong Five Years": "Duke of Jin went back to evil ways in order to attack the enemy. Gong Jian said: Guo is a sign of danger; If you die, you must follow it ... The so-called' auxiliary cars are dependent on each other, and the lips are dead and the teeth are cold' is also called danger. "

Close relationship and related interests.