On和Onto的区别

preposition – n. a word or group of words that is used to show direction, location, or time or to introduce an object

confuse – v. to make someone uncertain or unable to understand something

sofa – n. a long and comfortable piece of furniture on which a person can sit or lie down

stage – n. a raised platform in a theater or auditorium where performers or speakers stand

roof – n. the cover or top of a building, vehicle or something else