1·They are powered by an electric motor or an engine, connected through gears, belts, or a flexible elastomeric coupling to reduce vibration.
他们采用电动马达或引擎，通过连接的齿轮，皮带，橡胶或弹性耦合，以减少振动。
2·A flexible, usually elastomeric sealing element and housing used to seal an irregular surface such as a wireline.
一种能变形的、通常是弹性的密封部件和外壳，用于密封不规则的表面，如电缆等。