Allen, don't you dare go anywhere else, you hear?艾伦，其他地方哪儿都不准去，听到了吗？Men are anxious to improve their circumstances, but are unwilling to improve themselves; they therefore remain bound.--James Allen人们总是渴望改善周遭环境，但是却不...
...protons and electrons trapped by magnetic forces in the Van Allen belts.范艾伦辐射带的磁力俘获的质子和电子Blade tools: eyebolt turning tool , Allen key, screw tap, milling cutter, drill bits, etc.刀刃工具类: 埃令螺丝(吊环)、圆车刀 、 六角匙 、 丝攻 、 铣刀 、 ...