They have to protect them from disease and insect pests.

他们必须保护这些作物不受疾病和害虫的威胁。

The spread of diseases and insects is also tied to warming temperatures.

疾病和昆虫的传播也与气温升高有关。

Perfumed herbs or animal talismans were used to keep away diseases and insects.

香草或动物护身符被用来驱除疾病和昆虫。

Helping to mitigate the presence of diseases and insects that can be found down in the lower elevations still in the tropics while providing a better environment to use modern construction materials and techniques in like concrete and asphalt.

这有助于减少热带地区低海拔地区的病虫害，同时也为使用混凝土和沥青等现代建筑材料和技术提供了更好的环境。