单词seller-s-option
Quantity, unless otherwise arranged, shall be subject to a variation of 5% plus or minus at Seller"s option.
除非另作安排，量可由卖方选择作加或减5%的变动。
Seller may, at Seller" s option, extend the time for Buyer"s cure.
卖方可以（由其酌定）将买方补救的时间期限延长。
Packing: in bales or in wooden cases, at seller"s option
大包或木箱，由卖方任选