檢視拾级而下的原始碼

'''拾级而下'''逐级顺台阶而下。前足登上一个台阶，后足亦登上同一台阶与前足相并，谓之拾(shè)级。下台阶动作亦然。后亦泛指登台阶或下台阶。<ref>[https://www.zhihu.com/question/266023777/answer/1121351880 拾级而上中「拾级」为什么一定是而上不能搭而下？]知乎</ref>

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