平时非正式场合我们用social activities便可但在正式礼仪来往和正式文书中要用social formality关于formalityn.礼节, 仪式, 俗套拘泥礼节pl.【法律】规定的程序trivial formality 烦琐的礼节go through [check in]formality 办理(飞机等)的乘坐手续without formality 不拘形式地the -ties of a wedding [a funeral] 婚[丧] 仪式She didn't like the formality of the party. 她不喜欢宴会拘泥的礼节。That's the -ties of judical process. 这是司法程序的规定。