课桌上堆满了一英尺高的课本，刘的手腕只能长期压在冰铜课桌边缘，因而呈现出斑斑瘀青。
Mr. Liu’s wrist was bruised from pressing the edge of his blue metal desk, piled with a foot-high stack of textbooks.
这些是课桌。这些是桌子吗？不，不是。它们是课桌。
These are desks. Are these tables? No, they aren't. They are desks.
你看不见课桌上的东西。你能猜到课桌上有什么吗？
You can't see the things on the desk. Can you guess what's on it?
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