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

on the corner物體表面的角上；例：on the corner of the table
in the corner物體內(nèi)部的角落里；
at the corner物體外部的角落上（拐角處）

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平靜地；
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，在人間，到底，究竟，一點也不；
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驚奇地；
to one's surprise使某人吃驚的是；
by surprise使…驚慌 例：The question took the professor by surprise.