171. on the corner, in the corner, at the corner  

on the corner物体表面的角上;例:on the corner of the table
in the corner物体内部的角落里;
at the corner物体外部的角落上(拐角处)

172. warn sb. of, warn sb. against  

warn sb. of提醒某人注意某事;
warn sb. against提醒某人不要做某事 例:warm him against swimming in that part of the river

173. at peace, in peace  

at peace平静地;
in peace和平地 例:live in peace with one's neighbors

174. on earth, on the earth, in the earth  

on earth在世上,在人间,到底,究竟,一点也不;
on the earth在地上,在地球上;
in the earth在地下,在泥土里

175. in surprise, to one's surprise, by surprise  

in surprise惊奇地;
to one's surprise使某人吃惊的是;
by surprise使…惊慌 例:The question took the professor by surprise.