You can think of water fountain as water being pushed up out of a fixed thing in a public place. Sometimes that stream is aimed at your mouth, sometimes into a cup, and sometimes just into the air for people to look at. The words stay the same; what changes is who the water is for.
「water fountain」可以想成：在公共場合，有一個固定的裝置把水送出來。有時候那道水是對著你的嘴。有時候是流進你的杯子。有時候只是噴向空中給人看。兩個字沒變，變的是這道水給誰用。所以分辨哪個意思時，不必看字，要看句子裡的人在做什麼：彎腰喝、拿杯接、還是坐在旁邊拍照。
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