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| 1. | An aircraft that derives its lift from blades that rotate about an approximately vertical central axis |
| 直升机螺旋桨叶围绕一根近似垂直的中心轴旋转而使其升高的飞机 |
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| 2. | an area that is approximately central within some larger region. |
| 大约位于一个更大的区域的中心的一个地区。 |
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| 3. | Prior to 1870, however, political control by papal governments in central Italy spanned approximately |
| 1870年以前，意大利中部，教皇统治着政府，教皇的政治势力差不多延伸达1，600平方英里。 |
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