New words：

canal [kə'næl] n. 运河；沟渠
oceangoing ['əuʃən.gəuiŋ] adj. 远洋航行的；远洋的
Suez Canal [ˈsuːɪz kəˈnæl] 苏伊士运河

Sample Sentences：

Coal used to be sent here by canal.
Many oceangoing ships are sailing on the canal.
The ship is sailing towards Europe through the Suez Canal.

New words：

role [rəul] n. 作用；角色
The Panama Canal [ˈpænəmɑː kəˈnæl] 巴拿马运河
transportation [ˌtrænspərˈteɪʃ(ə)n] n.运输

Sample Sentences：

He denied any role in the robbery.
She acted as a minor role in the play.
She played the leading role in the school play.
The Panama Canal has played a very important role in transportation.

canal [kə'næl] n.运河；沟渠；管

New words：

average ['ævəridʒ]
n.平均水平；平均数；一般水准
adj.平均的；典型的；正常的；普通的
v.平均为；计算出…的平均数

Sample Sentences：

The average of 4,6 and 8 is 6.
If you average 4, 5 and 9, you get 6.
The average age of the boys in this class is fifteen.
There was nothing special about the meal; it was average.

New words：

rate [reit] n. 率；速度；比率；价格

Sample Sentences：

We drove at a steady rate.
The school has a 90% pass rate.
What's the rate for a single room?
House prices are rising at a higher rate than before.
Most people walk at an average rate of 5 kilometres an hour.

average ['ævəridʒ]
n.平均水平；平均数；一般水准
adj.平均的；典型的；正常的；普通的

New words：

crime [kraim] n. 罪；罪行；犯罪活动；罪过

Sample Sentences：

The crime rate is rising.
It's a crime to waste food.
When will the police solve the crime?
Many people believe that prison isn't a cure for crime.

rate [reit] n. 率；速度；比率；价格