loopers活套器loopn.环；圈；回路；环形线路vt.以圈结；以环连结；使 ... 成环（圈）vi.形成环；环形运动looping meander环状河曲loop power flow合环潮流loop identifier循环标识符loop of current电流环loop out effect环出效应loop - region环区loop line cable环线电缆loop back point环回点loop precooling回路预冷loopback driver环回驱动器