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1.The construction crew has been working on a large artificial mound for weeks.
施工队已经花了几周时间在一个巨大的人造土丘上工作。
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2. The engineer designed the artificial mound to withstand heavy rains.
工程师设计了这个人造土丘来承受大雨。
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3.The team used a machine to level the artificial mound and prepare it for planting.
团队使用一台机器平整了人造土丘，为种植做准备。