three main routes of absorption

例句：

1. 1. The absorption of nutrients is essential for plant growth.
   营养物质的吸收对于植物生长至关重要。
2. 2. The absorption of sunlight by the leaves helps to regulate the temperature of the plant.
   叶子通过吸收阳光帮助调节植物的温度。
3. 3. The absorption of carbon dioxide by the lungs is crucial for the body's energy production.
   肺部吸收二氧化碳对于身体的能量生产至关重要。