- trail 成一列纵队；挨次
on the trail of 跟踪追赶
paper trail 书面记录
blaze a trail 开辟道路；在树上作记号指路
nature trail 通往自然景观的
- trailstrail 审查跟踪，尾随审查；查帐索引；逐位跟踪
follow the trail 顺着足迹
in trail adv. 成一列纵队；挨次
on the trail of 跟踪追赶
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3G,
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