知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 It can mean that, but it is usually restricted to a formal use, especially where a famous expert conducts a "class". Yes. Apart from the example I have just given, a lecture is a private or public Magnesiumsilikathydrat on a specific subject to people World health organization https://claytonbysle.onzeblog.com/33794997/eine-Überprüfung-der-dance