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| 1. | In a large pit there are many steps just like terraced field, what are these steps for? |
| 我曾看见过一张露天矿的照片。在一个大坑的边缘，有许多像梯田那样的阶梯。它们是作什么用的? |
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| 2. | large extremely venomous pit viper of Central and South America. |
| 产于中美和南美的毒性异强的大槽角蝰。 |
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| 3. | hydropower stations, including Longtan, Xiaowan, Shuibuya, Goupitan, Sanbanxi and Gongboxia, and a number of large |
| “十五”期间中国将开工建设龙滩、小湾、水布垭、构皮滩、三板溪、公伯峡等一批大型水电站，同时将建设一批大型坑口电站。 |
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