请将下面这段话翻译成英文：

上海博物馆展出一件“透光镜”，它是西汉时期的珍品，直径为11.5厘米。这面铜镜与普通铜镜一样，背面有图案，还有铭文。

奇怪的是，当一束光线照到镜面，反射投影在墙壁上，墙上的光亮圈内竟出现铜镜背面的图案和文字，好像是从镜背“透”过来的，故称“透光镜”。

对于这种现象，在过去很长的时间里，科学家们都感到惊奇，人们把它称作“魔镜”。

　　参考译文

In Shanghai Museum, one finds a treasure of the Western Han period, the "penetrative bronze mirror", measuring 11. 5 cm in diameter. Like ordinary bronze mirrors, it bears patterns and inscriptions on the back.

But what amazes people is that when a bundle of rays is projected onto the surface of the mirror, which, in turn, reflects the light onto the wall, the patterns and inscriptions on the backside are shown in the ring of the light, as if they had penetrated the whole thickness of the mirror. Hence the name of the mirror.

For a long time in the past, even scientists were so puzzled at the phenomenon that it was called a "magic mirror."

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