A radioactive transuranic metallic element produced by bombarding with helium nuclei.
一种放射性超铀元素在用氦核子轰击时发现。
Alpha particles are these helium nuclei, and they are the result of radioactive decay.
阿尔法粒子是氦核，它们是放射性衰变的产物。
Alpha particles are positively charged helium nuclei obtained from natural radioactive decay.
粒子是从天然放射性蜕变得到的带正电的氦核。
The most damaging radiation are gamma rays and x-rays; energetic alpha rays (streams of helium nuclei) and beta rays (electrons) can also damage cells.
最具破坏力的辐射是伽马射线和X射线；能量强大的阿尔法射线（氦核能量流）和贝塔射线（电子流）也可以破坏细胞组织。
The particles are generally protons , electrons and helium nuclei and when they collide with nuclei in the Earth's upper atmosphere they can produce shower s of daughter particles.
这些粒子主要是质子、电子和氦原子核，并且当他们与地球高层大气中的原子核碰撞，就能产生次级粒子簇射。
The particles are generally protons, electrons and helium nuclei and when they collide with nuclei in the Earth's upper atmosphere they can produce showers of daughter particles.
这些粒子主要是质子、电子和氦原子核，并且当他们与地球高层大气中的原子核碰撞，就能产生次级粒子簇射。
When it had cooled further, these protons and neutrons were able to get together to form the nuclei of the lightest elements-hydrogen, helium and lithium.
而随着宇宙的进一步冷却，这些质子与中子便有能力团聚一起并组成质量最小元素中的核子，这些元素即氢、氦与锂。
This allows a short-range phenomenon called the strong nuclear force to take over and causes the nuclei to merge and form helium.
之后会出现强核力占主导作用的短距效应，进而，原子聚合成为氦。
This allows a short-range phenomenon called the strong nuclear force to take over and causes the nuclei to merge and form helium.
之后会出现强核力占主导作用的短距效应，进而，原子聚合成为氦。
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