useless species

基本解釋

Often those species that can be most easily bred are the most useless in reclamation .
往往最容易培養(yǎng)的種類在改良土壤中最無用。
translation-dictionary.net
Sometimes useless features stick around in a species simply because they’re not doing much harm.
有時人們不會去改掉一些沒有用的特點(diǎn)，衹因爲(wèi)它們竝沒有什麼壞処。
Such extravagant plumage would have been virtually useless for insulation or flying, but it might have attracted mates or allowed individuals of the species to recognize one another.
如此華而不實(shí)的羽毛對於保溫或飛行來說顯然是毫無用処，但卻有助於吸引異性或分辨同類。

All the inspiration in the world is useless if the environment is destroyed by our species.
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