词汇讲解：
1. recognize vt.认出；识别
例句：The software can recognize faces in photos and videos.
这款软件可以通过照片和视频识别人脸。
2. appear vi.出现，显现
例句：It makes you appear confident and in control.
它会让你显得自信和易于控制。
3. excited adj.兴奋的，激动的
例句：I was so excited I forgot to introduce myself.
我当时太激动了忘了自我介绍。
4. convention n.会议；全体与会者
例句：Chicago will stage some events in its convention centre.
芝加哥将会在其会议中心举办若干场赛事。
5. avoid vt.避开，避免
例句：To avoid getting wet, drivers must drive gently.
为了防止弄湿自己，司机必须小心驾驶。
6. define vt.规定；使明确
例句：Brazil and india define themselves as non-aligned developing economies.
巴西和印度定义自身为不结盟发展中国家。
7. worthless adj.无价值的，不值钱的
例句：But the brands themselves are practically worthless.
但品牌本身真的是一文不值。
8. fame n.名声；名望
例句：The fame galileo sought and obtained, he earned.
伽利略追求和获得的名声都是他赢得的。