This is not to suggest that the period of this biological clock is immutably fixed.

这并不是说生物钟的周期是固定不变的。

I can prove immutably I'm me.

我能证明我是谁。

Only reefs stand alone immutably on the beach after a typhoon.

台风过后，海滩上只有那些礁石岿然独存。

Note that this assumes that key columns are never updated; once a row exists, it is immutably tied to its primary-key value.

注意，这假设从不更新键列；一旦一行存在了，它的主键值就不变了。

In other words, the brain is not immutably "hardwired," and it may reorganize itself to better serve the organism and adapt to its changing internal and external environments.

换句话说，人脑不是不变的线路，它可以调整自己来更好地为机体服务，适应内外部的环境。