New words：

tourist ['tuərist] n. 游客；旅游者；观光者
visitor ['vizitər] n. 来访者；访问者；参观者；游客
traveller ['trævlə] n. 旅客；旅行者；游客
handbook ['hændbuk ]n. 手册；指南

Sample Sentences：

London is full of tourists in the summer.
The park attracts 2.5 million visitors a year.
The traveller's face was covered with insect bites.
We bought a tourist handbook before going travelling.

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