The combined contraction of the atria and ventricles is a heartbeat.心房和心室的这一系列动作合称为一次心跳.During inhalation, contraction of the intercostal muscles elevates the ribs.吸气时肋间肌收缩,提起肋骨.The surface electromyogram ( EMG ) and int...
他们想过要在20世纪80年代不停地出唱片。They flirted with the idea of making records throughout the 1980s.莉萨突然笑容满面地出现在门口时，她吓了一跳。She was startled when Lisa popped up at the door all smiles.他们急匆匆地出了城。They highballed out of town....