备投是什么意思简介：It has arrived in late autumn and is fast approaching winter. It is extremely cold in the morning. The hot air exhaled by people in the morning turns into cold air, which is then inhaled into the lungs and the cycle repeats.
It has arrived in late autumn and is fast approaching winter. It is extremely cold in the morning. The hot air exhaled by people in the morning turns into cold air, which is then inhaled into the lungs and the cycle repeats.
