因此，全面论述介词的定义、范畴，及物介词和不及物介词很有必要。
It is therefore necessary to describe the definition and category of prepositions as well as transitive and intransitive prepositions.
这是个不及物动词，当它后跟宾语时不要忘了加适当的介词。
This word is an intransitive verb when it needs an object, don't forget to put a preposition after it.
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