contrary; in reverse; inside-out or upside-down; to reverse; to return; to oppose; opposite; against; anti-; to rebel; to use analogy; instead; abbr. for 反切 phonetic system[cedict]
追踪
zhuī zōngㄓㄨㄟ ㄗㄨㄥ
to follow a trail; to trace; to pursue[cedict]
一下
yī xiàㄧ ㄒㄧㄚˋ
(used after a verb) give it a go; to do (sth for a bit to give it a try); one time; once; in a while; all of a sudden; all at once[cedict]