为了克服对在城市街道上遭陌生人攻击的恐惧，许多美国人现在在学习某种东方人的自卫(手段)，诸如空手道和武术，一般称为“功夫"或“武术"。

Sentence No. 1 Courses for adult students may be vocational or recreational, that is, they may be related to a person’s job or taken purely for interest and pleasure.

Sentence No. 2 To overcome their fear of unknown attackers on the city streets, many Americans now take instruction in some sort of Oriental self-defense, such as karate and martial arts, commonly known as "Gong Fu" or "Wu Shu".