by, we, going, Xi’an, are, to, train (.)

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【答案】We are going to Xi’an by train.

【解析】

by乘，we我们，going去，Xi’an西安，are准备，to去，train火车。根据所给的句号，可知句子是一个陈述句，根据所给词义可以连成句子：我们要坐火车去西安。故答案为We are going to Xi’an by train.