名词
中文翻译：空心的吊车
同义词：
['hollow tree', 'hollow log例句：1. The hollow tree wasa favorite spot for the birds to gather.（空心树是鸟儿最喜欢的聚集地。）']
例句：
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1. The hollow tree wasa favorite spot for the birds to gather.
空心树是鸟儿最喜欢的聚集地。
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2. The hollowlog was used as a fire starter bythe Native Americans.
空心木棒被美洲原住民用作点火工具。
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3. The hollow log was usedas a support for the roof of thehouse.
空心木棒作为房屋屋顶的支撑。