Healthier eating, longer lifespans and higher disposable incomes have helped to hold back the years.虽然健康的饮食 、 命的延长和较高的收入对于人们延缓衰老起到了一定的作用.They are still having to live on very low incomes.他们现在还得靠微薄的收入过日子。More than half of...
No other kind of electric charge has been found.到现在为止,还没发现其他种类的电荷.Electric charge may be detected qualitatively by sprinkling or blowing indicating powders.静电荷可以用撒布指示粉剂的方法,予以探测.They have no electric charge and are comple...