1. English is widely used in international intercourse.
    英语在当今国际交往中用得很广。

2. We don´t have much intercourse with him.
    我们和他没什么交往.

3. AIDS spreads in three basic ways: first, through sexual intercourse(性交); second, through contact with diseased blood; and third from an HIV mother to her baby.
    艾滋病的传播有三种基本方式：第一，通过性交；第二，通过接触艾滋病患者的血液；第三，经由携带艾滋病毒的母亲传给婴儿。