What are the two solar terms that the little man refers to?

It refers to the two solar terms "slight cold" and "great cold", which are the last two of the 24 solar terms.

Twenty-four solar term song:

Spring (beginning of spring) Rain (Rain) Surprise (Sting) Spring (Equinox) Sunny (Qingming) Valley (Grain Rain) Day,

Summer (long summer) full (small full) awn (awn seed) summer (summer solstice) two summers (small summer, big summer) even number,

Autumn (beginning of autumn) place (summer) dew (white dew) autumn (autumnal equinox) cold (cold dew) first frost (first frost),

Winter (beginning of winter) snow (light snow) snow (heavy snow) winter (winter solstice) slight cold (slight cold) severe cold (severe cold)