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在很长的一段时间里，一个声音总是萦绕在我的耳际，是什么声音呢？是皮鞋敲击地面的咔咔声。从去年的听课，就有一种感觉，为什么这种声音经常干扰学生的视听呢？而今年的评优课，这个问题更引起了我的注意——咔咔声不断、力度均为中强（但在音乐声里却显得特强）音色各不相
For a long time, a voice is always lingering in my ear. What kind of voice is it? It is the buzzing of leather shoes knocking on the ground. From last year’s lectures, there was a sense why this kind of voice often interfered with students’ audiovisual performance. This year’s evaluation class attracted more attention from me – the buzz was constant and the intensity was all strong (but it was extraordinarily strong in the sound of music).