1、and had rules and playing conditions modern athletes would not be unfamiliar with.

2、In the field of international law, it is difficult to be unfamiliar with its complexity.

3、Brown provides plenty of background information to help readers who may be unfamiliar with the Middle Ages.

4、However, it could also bring challenges, with many spectators likely to be unfamiliar with the norms of audience etiquette expected at sports such as archery or shooting.