on the corner物体表面的角上，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)on the corner of the table
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
warn him against swimming in that part of the river
173. at peace, in peace at peace平静地，in peace和平地 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 no use on earth
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
The question took the professor by surprise.
176. in the air, on the air, in the sky
in the air正在酝酿中，on the air播送，广播，in the sky在天空中
His show is on the air at 6:00 tonight.
177. in the field, on the field
in the field在野外，on the field在战场上 He lost his life on the field.
178. in the market, on the market
in the market表示场所或地点，在市场上，on the market出售
He sells fish in the market. Fresh vegetables are on the market now.
179. in the sun, under the sun
in the sun在阳光下，under the sun地球上，全世界 people under the sun
180. in a voice, with one voice
in a voice出声地，with one voice异口同声地 They refused with one voice.
181. through, across through穿越空间，across在…上穿过 through the forest, across the desert
182. on the way, in the way
on the way在前往…的路上，in the way挡路 The chair is in the way.
183. above, on, over above在上面，不接触，on在上面，接触，over在正上方 fly over the hill
184. until, not…until
until到…为止， not…until直到…才(常跟点动词连用)I waited until 3:00.
He didn't come until 3:00.
185. besides, except, except for
besides除了…还(包括在内)except除了(不包括在内)，
except for整体…除了某一点以外 The composition is good except for a few spelling mistakes.
186. whether, if
当是否解时，只有在宾语从句中二者可以互换，其余都用whether，当如果解时用if I don't know if/whether he will come. If he comes, I'll let you know.
187. and, or
and并且，or或者，否则，常用于否定句中 I don't like apples or bananas.
Hurry up and you'll catch the bus. Hurry up or you'll miss the bus.
