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....
Food is made up of carbohydrates, proteins and fats.食物由碳水化合物、蛋白质和脂肪构成。Common salt is made up of 40% sodium and 60% chloride.食盐由40%的钠和60%的氯化物构成。The shoreline was made up of a jumble of huge boulders.海岸线上堆着一大堆杂乱的巨石。...
Five - year - old Margaret Fash and six - year - old Andreas Faefel modelled fashions from Switzerland.五 岁 的玛格丽特·菲什和六 岁 的安德烈亚斯·费非尔替瑞士的时装模特儿表演.Five - year - old Margaret Fash and six - year - old Andreas Faefel modeled fa...