Which four 2-word words are related to spring?

1, vernal equinox, the midpoint of 90 days in spring, one of the 24 solar terms;

2, spring ploughing, ploughing the land before spring sowing;

3, warm spring, when it happens, there will be high temperature, low air pressure and early germination of vegetation;

4, early spring, also known as Meng Chun, early spring. The first month of spring is usually called the first month of the lunar calendar, especially the period from beginning of spring to surprise;

5, Yangchun, warm spring.