That country is a bulwark of freedom.那个国家是自由的堡垒。The abbeys were founded in the 12th century by King David as a bulwark against the English.这些修道院是12世纪大卫王用来抵御英国人而修建的堡垒。Our people’s support is a bulwark against the enemy.人民...
Today we are overpopulated, straining the earth's resources.现在我们人口过多，致使地球资源使用过度。Environmentalists say Australia is already overpopulated.环保人士认为澳大利亚已经人口过剩。Pollution is the price we pay for an overpopulated, over indu...
α粒子是从天然放射性蜕变得到的带正电的氦核.Alpha particles are positively charged helium nuclei obtained from natural radioactive decay.粒子 —— 氦核 —— 正通过试管被抛出, 从而在试管中形成人造迷雾.Alpha particles -- helium nuclei -- were being hurled through the tube...