New Words：

explorer [ɪkˈsplɔrər] n. 探险者；勘探者；考察者

Sample Sentences：

Christopher Columbus was one of the great explorers.
If you want to be an explorer, you must be adventurous.
The explorer told the boys about his adventures in the Arctic.

adventurous [əd'ventʃərəs] adj. 爱冒险的；大胆的；惊险的；有冒险精神的

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