Eg: Yesterday, I happened to meet the professor whom I got know at a party.昨天我碰巧遇见 了那位我在一次聚会上认识的教授。(“whom I got know at a party“为” the professor”的定语 从句” the professor为先行词Eg: Yesterday, I happened to meet the professor whom I got know at a party . 昨天我碰巧遇见 了那位我在一次聚会上认识的教授。(“ whom I got know at a party “为”the professor”的定语 从句, ”the professor”为先行词.)