He doesn't spray against pests or diseases.是什么意思？

He doesn't spray against pests or diseases.

他并不喷药防虫祛病。

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

spray

vt.& vi. 喷，喷射；n. 喷雾，喷雾器，浪花，（用作装饰的）小树枝；

例句
The nasal spray was new on the market and highly efficacious.
这种鼻腔喷雾剂是新上市的，非常有效。

against

prep. 反对，对…不利，紧靠，以防；

例句
His hand brushed against hers; it could have been either accidental or deliberate.
就在有意无意间，他的手轻轻拂过她的手。

pests

n. 有害的人或物( pest的名词复数 )，害虫，害兽，害鸟；

例句
Frogs eat pests which destroy crops and carry diseases.
青蛙吃破坏庄稼、传播疾病的害虫。

or

conj. 或，或者，还是，不然，否则，左右；prep. <古、诗>在…之前，比…更早；n. [纹章]黑金色、黑色；

例句
We are scared to abandon ourselves to our feelings in case we seem weak or out of control.
我们不敢放纵自己的情感，以免显得太过软弱或缺乏自制。

diseases

n. 疾病( disease的名词复数 )，弊端，恶疾，痼疾；

例句
The biology of these diseases is terribly complicated.
这些疾病的机理极其复杂。