1. This word possesses a syndrome of meanings.
    这个词有多种含义。

2. The rise of acquired immune deficiency syndrome (AIDS) around the earth has represented a major challenge to medical progress both in developed and in less — developed countries.
    全球艾滋病的蔓延无论在发达国家还是在欠发达国家都是对医学进步的重大挑战。

3. Acquired Immune Deficiency Syndrome (AIDS) was diagnosed in the United States in the late 1970s.
    艾滋病是20世纪70年代末在美国被发现的。