人類的單詞怎么拼

　　海豹的鰭肢與人類的手臂同源。

　　The seal's flipper is homologous with the human arm.

　　科學(xué)家不斷擴(kuò)大人類知識(shí)的范圍。

　　Scientists continue to push back the boundaries of human knowledge.

　　科學(xué)家已告誡人類慎重對(duì)待這項(xiàng)技術(shù)。

　　Scientists have sounded a note of caution on the technique.

　　需要交流是人類社會(huì)最重要的一個(gè)特征。

　　The need to communicate is a key characteristic of human society.

　　她畢生探索人類心靈的奧秘。

　　She spent her life plumbing the mysteries of the human psyche.