... compound gear train 复式轮系 conventional source of energy 常规能源 to the last drop 一滴不留 ...
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Installs, the work stable reliable, the laying of cable, not to consume the conventional energy source long easily, the service life and so on merits.
安装简便、工作稳定可靠、不敷设电缆、不消耗常规能源，使用寿命长等优点。
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