1. But tell me, Joe, how did you guess that I wasn´t giving music lessons?"
    告诉我，乔，你怎么猜到我不是在教音乐课？”

2. As a reasonable guess, they might, on an average, be 100 light years away.(A light year is the distance which light travels at 186,000 miles per second in one year, namely 6 million million miles.)
    据合理推算，外星人离我们平均距离也有100光年之远（1光年是光以每秒186，000英里的速度在一年内走的距离，即6万亿英里）。

3. Guess!
    你猜！

4. Guess-translating, he said one meant beobab tree, which is very common in West Africa, and another might be Mandinka for cow.
    猜着翻译，他说一个词的意思是beobab树，这种树在西非很常见，另外一个可能是母牛的曼丁哥语。

5. I guess he was just flattering me.
    我猜想他只是在奉承我。

6. It is impossible to make more than the wildest guess at how many they kill,
    它们一年中消灭了多少昆虫，我们简直无法猜测，