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.
可以想成：畫兩個東西，中間拉一條線，然後在線的兩端都畫上箭頭。第二個箭頭就是 inter- 加進來的東西。沒有哪一邊只是出發點，也沒有哪一邊只是終點。線上跑的東西可以來，也可以回。看懂這個畫面之後，不管那條線是水道、是牆上的一扇門、是電路板上的銅線，還是兩個想法之間的牽連，用法都一樣。
From the word’s history
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。
Wiktionary, "interconnect"
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