You can picture well-endowed as a hand that has already given , before anyone asked. Something arrives already supplied: a school with a fund left to it, a person born with patience, an island with water under the ground. The word never says the supply was earned — it says it was given, and there is plenty of it. All the other uses are that same 'given a lot' picture pointed at something different.
well-endowed 可以想成一隻已經先給過的手。東西還沒開口要，就已經被配得很足。可能是學校收到的一筆基金。可能是一個人天生的耐心。也可能是一座島下面本來就有的水。這個字都不強調努力換來。它強調的是「有人給了，而且給得多」。後面幾個用法，就像同一個畫面換個對象。
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