Thus the snakes were able to switch back and forth between the two systems.
如此看来,蛇能够在两种系统之间转换自如.
来源:互联网摘选A metal ring that moves freely back and forth on a rope, rod, or spar.
滑环在一根绳 、 杆子或圆材上可以自由来回移动的金属环.
来源:网络文摘精选We see an extremely excellent scene of the fire dragon shuttling back and forth among fireworks.
焰火中,火龙穿梭,火花四射,异常精彩.
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