missing link meaning in English

缺少的环节,未知的环节

The evolution of today's universe follows with very few missing links in the chain of reasoning .
当前的宇宙演化的一套理论中有很少的未知环节。
It was this "law of avogadro" which supplied the missing link in dalton's atomic theory .
正是这条阿伏伽德罗定律弥补了道尔顿原子学说中遗漏的环节。
This step was taken by italian biologists, who provided the last missing link in man's search for the cause of malaria .
意大利生物学家完成了这一步骤，从而填补了人类探索虐疾病因所缺少的最后一个环节。
If mankind see you , it will think you are the missing link
如果人类看到你，就会以为你就是那半人猿了。
Are you familiar with the theory of the missing link between apes and humans
你对“人猿之间的缺失环节”理论熟悉吗？

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