Both fertilizers and manure release nitrogen into natural systems such as rivers, upsetting the natural balance.
化肥和粪肥都释放氮到自然生态系统,如河流,从而破坏自然的平衡。
2
And smiling has been clinically shown to lower blood pressure, boost immunity, and even releasenatural painkillers (endorphins), each of which lowers stress, boosts happiness, and improves health.