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

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