搜索

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

痕迹

hén jì vestige; mark; trace

清除

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

如何

rú hé how; what way; what

恢复

huī fù to reinstate; to resume; to restore; to recover; to regain; to rehabilitate

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