以下为句子列表:
英文: The authors studied the structural design and the working principle of two new types of water-saving percussion tools, water-saving hydro percussive tools and pneumatic steel ball percussion tools.
中文: 从分析干旱缺水地区节水型冲击器的设计思路出发,对两种新型节水冲击器―风动钢球冲击器和液动冲击器的结构设计、工作原理进行了研究。
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