360 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]

清除

qīng chú to clear away; to eliminate; to get rid of

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