... 无穷长线 infinitely long line 无穷乘积 infinite product 无穷乘积表示 infinite product representation ...
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infinitely large quantity long line 无穷长线
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I have not come to conclusions about a line source that extends floor-to-ceiling, is infinitely long acoustically, and thus generates a cylindrical wave.
从地板到天花板的线性声源，它在声学上是无限长的，所以会产生柱形波。对于这个我还没有得出结论。
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