1. 反对的;抵制的;抗拒的
    Someone who is resistant to something is opposed to it and wants to prevent it.

    e.g. Some people are very resistant to the idea of exercise.
           有些人十分反对锻炼。

2. 有抵抗力的;不受…损害的
    If something is resistant to a particular thing, it is not harmed by it.

    e.g. ...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
    e.g. The body may be less resistant if it is cold.
           天冷时，身体的抵抗力会下降。