1 . 假定你是李华，计划在暑假期间骑行游览丝绸之路西安至兰州路段（约660公里）。请给你的加拿大朋友Henry写封邮件，邀请他参加。内容包括：
1）出发时间；
2）骑行路线；
3）注意事项。
注意：1）词数100左右；
2）可以适当增加细节，以使行文连贯。
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