once-function

基本解釋

These chromosomal regions could be composed of the now-defunct remains of ancient genes, known as pseudogenes, which were once functional copies of genes but have since lost their protein-coding ability (and, presumably, their biological function).
這些染色躰區(qū)域可能由現(xiàn)在死亡的遠古基因殘餘組成，如熟悉的假基因，它們曾經(jīng)發(fā)揮過基因複制功能衹是已經(jīng)喪失了蛋白質(zhì)編碼能力（大概爲它們的生物學作用）。
It is necessary that he be sent there at once.
有必要馬上派他到那裡去。
She writes to her parents once a week.
她每周給父母寫一封信。
More than once I've felt my heart slip a cog.
我不止一次感到心髒突然停跳一下。
My inn had once been a part of an ancient ecclesiastical house.
我的客棧曾經(jīng)是一個古老教會的房子的一部分。