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较高的湿度可以受益的虎皮鹦鹉,但不是必不可少的。
A higher humidity can benefit your budgerigar , but is not essential .
但中心粒对于纺锤体的形成并不是必须的,尽管具有相似的结构-基体,中心粒对于波动足微管的形成有重要作用。
However , the centriole is not essential for spindle formation , although an analogous structure , the basal body , is responsible for organizing the microtubules of undulipodla .
如果激振点安设得当,这个要求在实际上并不重要。
This requirement is not essential in practice if the locations of the exciter stations are chosen judiciously .