同时存在

With the quincunx as well, it can be difficult to merge the energies of the planets involved.

她觉得角色不能同时存在，而同时间要做个这样角色会令她不舒服。

The evolvement from orderless to ordered and the degenerate from orderless to ordered are exiting synchronously in the nature.

自然界存在着无序到有序进化，同时也存在有序到无序退化。