They take an atom of lead, accelerate it and have it collide with an atom of nickel.
他们选取一个铅原子,将其加速,让它与镍的原子碰撞。
麻省理工公开课 - 固态化学导论课程节选
So, you've got polonium or thorium sitting inside this leaded box with one opening.
把钋或者钍放在,开一个小口的含铅的盒子里面。
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