1 N-COUNT (常指埋于地下的石油或燃气)管道,管线 A pipeline is a large pipe which is used for carrying oil or gas over a long distance, often underground. (常指埋于地下的石油或燃气)管道,管线
SYN tube, passage, pipe, line
2 PHRASE 在筹备中;在进行中 If something is in the pipeline, it has already been planned or begun. 在筹备中;在进行中
SYN on the way, expected, coming, close
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