Have you ever seen a building in motion that actually changes its shape?
你见过一个建设议案，实际上改变它的形状？
The shape of gypsum crystal changes little in the presence of Al 3+ ion.
当氟与铝共存时，石膏晶体的外形发生了极大的变化，几乎都形成了球状聚晶；
The shape of gypsum crystal changes little in the presence of Al 3+ ion.
当氟与铝共存时，石膏晶体的外形发生了极大的变化，几乎都形成了球状聚晶；
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