A sailboat in clouds of smoke in a single combat with a sea dragonA sailboat in clouds of smoke in a single combat with a sea dragon
A single swimmer rafting on a canoe at the moment of passing a raging turn of the riverA single swimmer rafting on a canoe at the moment of passing a raging turn of the river
I'll eat you up and i won't choke on a single boneI'll eat you up and I won't choke on a single bone
Без других, в отдельности. Тот же самый, тожественный. Единый, целостный. Число, цифра и количество 1. Какой-то, некий. Только, исключительно. Какой-нибудь в ряду сходных.