他们又是跳绳，又是玩接球，等着上课铃声响起。They skip rope and play catch, waiting for the bell.跳绳是最有乐趣的有氧健身运动之一。Skipping is one of the most enjoyable aerobic activities.外面孩子们一边跳绳一边唱着歌。Outside, children were skipping and singing a rhyme....
煤气柜: 容器气体是储存.Gas tank: container where gas is stored.通过失重挂片及电化学极化曲线测量,查明并分析了湿式煤气柜水封部位发生腐蚀的主要原因.The corrosion case analysis of a water sealed gas tank loss test and potentiodynamic polarization measurement....