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It is a continuous analogue of the discrete Kronecker delta.

delta在数学上是一个无限狭窄的峰，对全空间积分（即求其曲线所包含的面积）为1。

Catamite Coolies and Chinese Sodoms : British Investigations into Chinese Labourers Sexuality in the 19th 20th Centuries Ross Forman School of Oriental and African Studies A common accusation levelled against Chinese labourers brought to various British colonies at the end of the nineteenth century and the early twentieth century was that they were undesirable because of their penchant for pederasty .

十九世纪末到二十世纪初，英国的各个殖民地共同出现了一种针对中国劳工的控诉：指责他们是一些惹人讨厌的人，因为他们有鸡奸的嗜好。