a person who to tries to persuade other people to accept a particular religious or political belief, idea, or way of life

I sat next to a woman who turned out to be a Buddhist proselytizer. 我坐在一位女士身边，不料她极力劝我信佛。

She is a tireless proselytizer for her profession. 她是个不倦的说客，想拉人加入她那一行。