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....
该公司承接各类汽车的修理工作。The company undertakes mechanical work on all types of cars.还是大白天，但所有汽车的前灯都亮起来了。It was still daylight but all the cars had their headlights on.汽车的功率越大，就越难驾驭。The more powerful the car the more difficult it ...
With the change of the economic foundation the entire immense superstructure is more or less rapidly transformed.随着经济基础的变化,整个庞大的上层建筑也会不同程度地发生迅速变革.Cypress and redwood are seldom used in the superstructure of commercial gr...