1. What should I do? During this very difficult time, I couldn't tell anyone for fear I wouldn't be able to compete in the Olympics if people learned I was HIV-positive.
    我该怎么办？然而在这艰难的时刻，我却不能把这些告诉任何人，因为一旦人们知道我是艾滋病毒阳性，我便不能参加奥运会比赛了。

2. The children compete against each other to reach the other end of the pool.
    孩子们竞相向池的另一头驶去。

3. The last creature to compete with man was the mosquito.
    能与竞争的生物最后只有蚊子，

4. The children compete against each other to reach the other end of the pool.
    孩子们比赛看谁先到达游泳池的另一端。