3月27日,美国加利福尼亚大学圣地亚哥分校(University of California San Diego)在《自然》(Nature)发表题为《全球变暖推迟全球计时问题》(A Global Timekeeping Problem Postponed by Global Warming)的文章指出,全球变暖导致格陵兰岛和南极冰川加速融化,两极冰川...
Sperm competition and sexual selection. Birkhead, Tim., Mller, A. P. (Anders Pape). San Diego: Academic Press. 1998. ISBN 978-0121005436. OCLC 162128897. Simmons, Leigh W. (2001). Sperm competition and its evolutionary consequences in the insects....
保罗 乌切洛《圣罗马诺之战》 Battle of san Romano Paolo Uccello 1440 乌切洛名作《圣罗马诺之战》,显示出直线透视法领域的突出成就。前景是交战双方,后面是持矛的队伍,地上横七竖八丢弃的武器盔甲。背景经过几何式的抽象处理和透视安排,具有强烈的空间效果。 乌切...
经济学人 Covid has reset relations between people and robotsMachines will do the nasty jobs; human beings the nice onesROBOTS HAVE been around for six decades or so. Originally, they were simple devices which did as ...