Beside having similar properties to mollusc shell nuclei, the new pearl nuclei possess some advantages such as white color, strong luster, round shape and cheap cost.

这种珠核物化性质与现有贝、蚌壳珠核相近，具有颜色白、光泽强、外形圆和价格低廉等特点。

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Nuclei with closed-shell have spherical symmetries.

闭壳核具有球对称性。

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Under the laws of quantum mechanics, the nuclei of atoms have shell-like structures analogous to the spheres in which given Numbers of electrons exist in certain orbits around the nucleus.

根据量子力学的法则，核子外部一定数目的核外电子以一定的圆周轨道运行形成球状壳结构。

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Under the laws of quantum mechanics, the nuclei of atoms have shell-like structures analogous to the spheres in which given numbers of electrons exist in certain orbits around the nucleus.

ECONOMIST: Nuclear physics