This meant that at these points if a ship got stuck, it could be bypassed by other ships using the newly built adjacent channels.
这意味着，如果一艘船在这些地方被困住了，它可以被其他船只绕过，使用新建的相邻航道。
英语百科
Adjacent channel
In broadcasting an adjacent channel is an AM, FM, or TV channel that is next to another channel. First-adjacent is immediately next to another channel, second-adjacent is two channels away, and so forth. Information on adjacent channels is used in keeping stations from interfering with one another. See Adjacent-channel interference.