（）whites are going on (）visit to the Great Wall

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（）whites are going on (）visit to the Great Wall
（）whites are going on (）visit to the Great Wall

（）whites are going on (）visit to the Great Wall
（The）whites are going on (a）visit to the Great Wall
the家人名表示一家人
后面是固定词组

the whites are going on a visit to the Great Wall

(The) whites are going on (a)visit to the Great Wall.