请说明形声字“衷” “背” “策”的形旁和声旁的结构关系和这些字的本义。Please explain the structur
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请说明形声字“衷”、“背”、“策”的形旁和声旁的结构关系和这些字的本义。Please explain the structural relationship between the semantic and phonetic element of those pictophonetic characters “衷”, “背”, “策” , and also their original meanings.

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