One way to hold this word: draw two things with a line between them, then put an on both ends of the line. That second is what inter- adds. Nothing here is only a source and nothing is only a destination; whatever travels along the line can come back the other way. Once you see that, the word works the same whether the line is a water channel, a door in a wall, a copper track on a board, or the tie between two ideas.
The packet's source gives the word as inter- plus connect: connect puts the link there, inter- says it runs between and both ways.
packet 的詞源寫得很直接：inter- 加 connect。connect 負責「接上」，inter- 負責「在彼此之間、雙向」。這個字幾乎是把自己的畫面寫在臉上，所以拆開看就懂。
packet Wiktionary etymology_text (kaikki:3f6f69a190036ae4:1321395852:9347)
Two branches
實體上接通
這一組就是核心畫面本身：兩邊之間真的有一條路，水、人、電、資料都能來回。名詞用法也在這裡，因為它指的正是那條線本身。
verb · B2
If two or more systems, places or machines are interconnected, or if they interconnect, they are joined to each other, so that things can pass or move between them in both directions.
相連、相通
看不見的東西互相牽動
同一條雙向的線，只是兩端換成摸不到的東西。線還在，只是現在線上跑的是影響力：這邊一動，那邊就跟著動。
verb · B2
If two facts, ideas or events are interconnected, or if they interconnect, they are related in a way that means a change in one shows up in the other.
互相牽動、環環相扣