因它是空的。
This is the root node of the test list hierarchy and, initially, it is empty.
这是测试清单阶层的根节点，一开始是空白的。
The trash can still has a plastic bag in it, although, as the mouse will soon discover, it is empty.
垃圾桶里还有个塑料袋，不过老鼠很快就会发现，那是空的。
Look at the water jug. It is empty.
您看那水罐，它空了。
现在箱子是空的。
现在箱子是空的。
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