biological law meaning in English

生物学定律

He quoted spencer and malthus , and enunciated the biological law of development
他引用了斯宾塞和马尔萨斯的话，阐述了生物发展的规律。
They shook him with lines of thought that were new to him ; and gave him insights , not into new biological laws , but into new applications of the old laws
他们用一些他从没有听见过的思路震撼了他，启发了他，他们并没有提出什么生物学的新规律，而是启示他从新的角度使用旧规律。
To martin this withered wisp of a creature was a symbol . he was the figure that stood forth representative of the whole miserable mass of weaklings and inefficients who perished according to biological law on the ragged confines of life . they were the unfit
马丁觉得这个萎缩的生灵便是一个象征，一个突出的形象，代表着整个可怜的软弱无能的群体，按照生物学的规律在生命的狭窄崎岖的天地早被消灭掉，因为他们不是“适者” 。