New Words：
track [træk]
n.跑道；轨道；轨迹；（推土机等的）履带
v.跟踪；追踪
Sample Sentences：
You'll find your train at track 8.
The train for Chicago is on track 9.
We followed the bear's tracks in the snow.
Our teacher made us run around the track ten times!
The police used dogs to track the criminal.
It's difficult to track an animal right after rain.
criminal [ˈkrɪmɪnl] n. 罪犯
New Words：
foolish [ˈfuːlɪʃ] adj. 愚蠢的; 傻的
Sample Sentences：
He is not so foolish as you think.
Forgive me for all the foolish things I said.
It's very foolish of you to believe what he said.
New Words：
festival [ˈfestɪvl] n. 节；节日
Sample Sentences：
I can't spend the festival with you.
May I invite you to organize the Food Festival with me ?
Wish all of my friends to be happy on the Dragon Boat Festival!
New Words：
referee [ˌrefəˈriː] n. 裁判;裁判员
Sample Sentences：
A referee must know all the rules of the game.
The referee blew his whistle to end the match.
The referee showed two red cards in the game today.
New Words：
operate [ˈɒpəreɪt] v. 操作；工作；运转；动手术
operation [ˌɒpəˈreɪʃn] n. 操作；运行；运作；手术
Sample Sentences：
The doctors operated last night.
We will have to operate on his eyes.
Will I need to have an operation ?
He had an operation on his knee.
It was foolish of him to go jogging so soon after his operation.
foolish [ˈfuːlɪʃ] adj. 愚蠢的; 傻的