以轻快的步伐上路to set off at a brisk pace轻快的舞蹈给这场戏渲染了欢乐气氛.The lively dance heightened the joyous atmosphere of the scene.那位女演员正以轻快的步伐走着.The actress is walking at a brisk pace....
Methane gas does collect in the mines around here.周围的矿井里的确有沼气聚积。The ignition of methane gas killed eight men.甲烷起火,致使8人丧生。Methane and propane are alkanes.甲烷和丙烷是烷烃。...