Someone who is resistant to something is opposed to it and wants to prevent it.
Some people are very resistant to the idea of exercise.
一些人非常反对锻炼。
If something is resistant to a particular thing, it is not harmed by it.
how to improve plants to make them more resistant to disease.
如何改良植物以增强它们对病害的抵抗力。
The body may be less resistant if it is cold.
当天气寒冷时,人体的抵抗力可能会降低。