词义的引申主要通过相关和相似这两条途径。例如“口”指人和动物进食的器官，有的也是发育器官的一部分。“口”是人和动物的器官，而人和动物只有一个这样的器官，所以“口”就可以引申为计算人和动物的量词（一家五of三口猪）。这是相关佳产生的引申义。“口”由人和动物的? The extension of meaning mainly through the two related and similar ways. For example, “mouth” refers to the human and animal eating organs, and some are also part of the development of organs. “Mouth” is a human and animal organ, and humans and animals have only one such organ, so “Mouth” can be extended to measure human and animal quantifiers (a family of five or three). This is a good extension of the relevant good. “Mouth” by people and animals?