Two pairs of men and women, a pair of twitter always have something to say, a pair of silent, you guess their relationship

Every night in the parking lot, there are always two cars, a tricycle, a pull truck, and they all collect garbage. One collects hotel garbage has recycling value, and one collects domestic garbage. The tricycle is about fifty men and a woman, and it takes about an hour and a half to collect the recycling value, and the car is thirty or forty years old, a man and a woman generally leave within a quarter of an hour. The people on the tricycle listened to them communicate for the first time in half a year but they quarreled, and learned from them that they were husband and wife. The men and women in the car came and went in a hurry, but they had never seen them stop talking, from talking in to talking out, and they were just colleagues. How many couples in life are relatively speechless, but have endless words with others?