(1)使用外文斜体的情况:物理量符号、变量符号、坐标系符号;表示旋光性、构型、构象、取代基位置的符号:d,l-(外消旋),Z,E-(顺,反),R,S-,o,m,p-(邻,间,对),N,N-等。(2)使用外文正体的情况:单位符号,元素符号,射线符号(X、α、β、γ等),粒子符号(电子e,质子p,中子n,核子N),基团 (1) the case of using foreign italics: physical quantity symbol, variable symbol, coordinate system symbol; sign indicating optical activity, configuration, conformation, position of substituent d, l- (rac), Z, E- , Anti), R, S-, o, m, p- (o-, m-, p-), N, N- and the like. (2) In the case of using foreign languages, unit symbols, element symbols, ray symbols (X, α, β, γ etc.), particle symbols (electron e, proton p, neutron n, nucleus N)