TSUMUGU · TOCFL 3 (est.) · 詞
原因
ㄩㄢˊ ㄧㄣ · yuányīn
noun — reason; cause; the underlying factor
字源 FORM — what the parts do
原source; original; plain (原來的原)yuán厂 (cliff face) + 泉 (spring) — a spring flowing from the base of a cliff; the source, the original
因cause; because; due to (原因的因)yīn口 (enclosure) + 大 (person) — a person enclosed; something that constrains and produces an outcome; cause
原因，原來的原，因此的因。
故事 STORY — a scene to remember it by
水從崖底（厂）冒出（泉）——原。有人被困其中（因：大+口）——因。原因，就是源頭加上那道牆。
The spring breaks from the cliff base (原: 厂+泉, the source) and something enclosed makes it press outward (因: 大 inside 口, a person in a box) — cause is source plus constraint.
字源記憶法