A mistake is something you do wrong.

表示做错的事。

→ My boss always yells at me when I make a mistake.

我每次犯错都会被老板呵斥一顿。

To observe something is to watch it.

表示看着。

→ Brian observed the sun rising over the mountains.

布莱恩在山上看日出。

An opportunity is a chance to do something.

表示做某事的机会。

→ I had an opportunity to take pictures in the jungle.

我有幸能在这片丛林里拍照。

A prize is something of value that is given to the winner.

获胜一方获得的奖励。

→ I won a prize for getting the best grade on my science test.

我因为科学考试得了第一名而获奖。

A race is a contest to see who is the fastest.

表示比谁更快地一种比赛。

→ Paul is a fast runner, so he easily won the race.

保罗跑得很快，所以他轻松胜出。