搜索

sōu suǒ to search (a place); to search (a database etc)

痕迹

hén jì vestige; mark; trace

怎么

zěn me how?; what?; why?

zěn me variant of 怎麼|怎么[zen3 me5]

留下

liú xià to leave behind; to stay behind; to remain; to keep; not to let (sb) go

来

lái to come; to arrive; to come round; ever since; next

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