lessening virulence of any pathogenic organism

例句：

1. 1. The temperature is gradually lessening as the sun sets.
   随着太阳落山，温度逐渐降低。
2. 2. The pressureon the team has beenlessening recently.
   最近，团队的压力正在减轻。
3. 3. The amount of sugar inthe drink is being lessened to makeit healthier.
   为了使其更健康，饮料中的糖分正在被减少。