这表示可以有多个这样的子元素，这完美地解释了在一个典型购买订单中可以包含多个不同的条目。
This means that there can be many of them, which makes perfect sense because a typical purchase order may contain many different items.
但对这种现象，有一个完美的自然天体物理学解释。
But the phenomenon has a perfectly natural astrophysical explanation.
这里有一个完美的解释为什么会这样。
The story has a full explanation of how this came to be, so click on over.
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