This is a poem describing the weather and scenery in spring, which means that the continuous drizzle in spring causes the temperature to remain low and does not completely warm up. This kind of weather is called late spring cold. However, even if the temperature is low, some apricot flowers have already bloomed. These red apricot flowers seem to lock the spring smile and add vitality and beauty.
The whole sentence tells about the precipitous cold in late spring and the softness of apricot flowers, and expresses the poet's emotion and praise for spring.