2). Information sent through a communications channel has a source from which the information originates, and a destination to which the information is delivered.通过信道发送的信息都有 个信息源和送达的目的地。 注释:该句中的 sent through a communications channel是过去分 词短语作定语,修饰主语 information; from which the information originates和 to which the information is delivered是介词前置的定 语从句,分别修饰两个宾语: a source和 a destination 2021/2/20 P32021/2/20 P.3 2）Information sent through a communications channel has a source from which the information originates, and a destination to which the information is delivered. 通过信道发送的信息都有一 个信息源和送达的目的地。 注释：该句中的sent through a communications channel是过去分 词短语作定语，修饰主语information; from which the information originates和to which the information is delivered是介词前置的定 语从句，分别修饰两个宾语：a source 和a destination