This means the dog must stay down even if the owner or someone else tosses a ball in front of the dogs feet or drops a hot dog 4 feet from where he is lying.
这就意味着即使有人在狗儿面前扔出一个球或食物,狗儿也必须卧下不动。
The impact of an asteroid at the moon's South Pole 4 billion years ago threw out a colossal surge of debris - like a dog furiously digging a hole in the sand.
这40亿年前发生在月球南极的小行星撞击抛出了一大片碎渣——就像一只狗疯狂地在沙地里刨洞一般。
In the example in Listing 4, I extended Dog from the inside.
在清单4的例子中,从内部扩展了Dog。
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