One million meters a day, homophonic: one meter a day, which means that rice is only enough for one day, which is not good;

M trillion, which means: with trillion grains of rice, your children will be well-fed and prosperous in the future;

Millions of liters of rice, homophonic: one liter of rice, only one liter of rice at home, will be poor in the future, which means bad.

Above, if you are a family member, think more!