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...
the expansion and contraction of the metal金属的膨胀与收缩Contraction of the timbers left gaps in the fence.木料收缩,结果围墙露出缝来.The forces of expansion are balanced by forces of contraction.扩张力和收缩力相互平衡....
...a protest against imperialism and oligarchy in the region.对该地区帝国主义和寡头政治的抗议And he has often fallen foul of the Argentinian oligarchy.同时他还时常与阿根廷的寡头统治相抵触.Insecure and fearful of its own people, the oligarchy preserves it...