这些术语均是指法律文件（如合同、遗嘱等）中所约定或规定的要求履行某些行为的条件。区别在于single condition是指要求只履行一种特定的行为，故为“履行一种行为的条件要求”[1]。copulative condition是指要求履行多项行为，故为“履行多项行为的条件要求”[2]。disjunctive condition则为“履行多项行为中的一项的条件要求”[3]

[1]“ A condition requiring the performance of a specified thing. ”Cf. Bryan A. Garner, Black's Law Dictionary, 7th edition, at p. 290, West Group (1999).

[2]“ A condition requiring the performance of more than one act. ” Id. at p. 289.

[3]“ A condition requiring the performance of one of several acts. ” Id. at p. 289.

“ Conditions may be single, copulative，or disjunctive. Those of the first kind require the performance of one specified thing only；those of the second kind require the performance of divers acts or things ； those of the third kind require the performance of one of several things. ”Cf. The Publisher's Editorial Staff, Black's Law Dictionary, abridged 6th edition，at p. 203, West Publishing Co. (1991 ).