The clash between the Brazilian president and the local authorities sent confusing signals regarding the COVID-19 pandem......

<正>在《笑侃三十年》中,周立波说,做人要有腔调。据说,"腔调"这词是从上海人的弄堂里传出来的,一开始带有贬义色彩,后来慢慢地成......

This paper gives an analysis of the dynamic characteristics of situation elements (SEs) in situation awareness (SA)resea......