Think of a place as a container with an opening. Water runs in through that opening, and inflow is that running-in, or how much runs in. Once you can see the water, you can see the whole word: anything that arrives from outside in a steady stream can be described the same way.
可以想成一個容器，上面有一個進水口。水從那裡一直流進去，這個「流進來」就是 inflow。它同時可以指流進來的動作，也可以指流進來的量。只要先看得見水的畫面，其他用法就好懂了。因為英文常把錢、人、貨物也當成會流動的東西，讓它們從外面流進一個地方、一個國家、一家公司。
From the word’s history
Wiktionary records inflow as Middle English inflowen, that is in- plus flow, so the word is built directly out of in and flow.
根據 Wiktionary，inflow 來自中古英文 inflowen，等於 in-（進來）加 flow（流動）。所以這個字的意思幾乎就是兩個部分疊起來，跟今天的用法完全對得上。
Wiktionary entry for inflow (packet evidence kaikki:3f6f69a190036ae4:618532344): From Middle English inflowen, equivalent to in- + flow.
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