You can picture a glass of water with sugar going in, spoon by spoon. Every vanishes, until one does not. From that moment the glass is holding all it can, and anything more just sits there, wasted. Saturation point names that exact moment of no more room, and the word keeps working the same way whether what is filling up is a liquid, the air, a street, or a person.
可以想成一杯水，糖一匙一匙加進去。每一匙都化掉，直到有一匙沒化。從那一刻起，這杯水已經裝到極限，再多加的只會沉在底下，白白浪費。saturation point 指的就是那個「再也裝不下」的臨界點。不管在裝東西的是液體、空氣、一條街，還是一個人的腦袋，這個字的運作方式都一樣。
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