171. on the corner / in the corner / at the corner
on the corner 物体表面的角上（接触表面）例句：There is a cup on the corner of the table.in the corner 物体内部的角落里（空间内侧）例句：A cat is hiding in the corner of the room.at the corner物体外部的拐角处（道路/建筑外侧拐角）例句：We met at the corner of the street and the park.
172. warn sb. of / warn sb. against
warn sb. of 提醒某人注意某件事/某种危险（后接名词/代词）例句：The teacher warned us of the coming exam.warn sb. against 提醒某人不要做某事（后接 doing sth./名词）例句：My mother warned me against going out alone at night.
173. at peace / in peace
at peace （内心 / 状态）平静地；处于和平状态（侧重自身情绪/局势）例句：She is at peace with herself after making the decision.in peace（相处 / 生活）和平地；安宁地（侧重与他人 / 环境的相处）例句：We should live in peace with all living things.
174. on earth / on the earth / in the earth
on earth 究竟，到底（用于疑问 / 否定句加强语气）；在世上例句：What on earth are you doing? Humans on earth need water and air.on the earth 在地球上；在地面上（具体的空间位置）例句：There are millions of species on the earth.in the earth 在地下；在泥土里（侧重地表以下）例句：Some animals hibernate in the earth in winter.
175. in surprise / to one's surprise / by surprise
in surprise 惊奇地（作状语，修饰动作，表 “带着惊讶的状态”）例句：She looked at me in surprise when I told her the news.to one's surprise 使某人吃惊的是（作插入语，后接完整句子）例句：To my surprise, he passed the exam without studying.by surprise 出其不意地；使… 惊慌（表 “突然发生，让人来不及反应”）例句：The sudden rain took us by surprise.
176. in the air / on the air / in the sky
in the air 在空中；（计划/情绪）正在酝酿中，悬而未决例句：The kites are flying in the air. There is a sense of joy in the air.on the air （广播 / 电视）正在播送，播出例句：The live show is on the air now across the country.in the sky 在天空中（侧重具体的天空空间，无引申义）例句：There are many stars in the sky at night.
177. in the field / on the field
in the field 在野外；在实地；在某一领域（工作/研究）例句：Scientists are doing research in the field. He is a leader in the field of AI.on the field 在战场上；在运动场（球场/赛场）上例句：The soldiers fought bravely on the field. Players are training on the field.
178. in the market / on the market
in the market 在市场里（表具体场所/地点，侧重 “位置”）例句：My grandma likes to buy fruit in the market.on the market 上市；出售（表状态，侧重 “可购买”）例句：The new model of the phone will be on the market next month.
179. in the sun / under the sun
in the sun 在阳光下（表具体的光照环境）例句：It's comfortable to read a book in the sun in winter.under the sun 全世界；天底下（用于加强语气，无实际 “在太阳下” 含义）例句：Under the sun, there is no two identical leaves.
180. in a voice / with one voice
in a voice 用… 的声音；出声地（后可接形容词修饰声音，如 in a low voice）例句：He spoke in a soft voice so as not to wake the baby.with one voice 异口同声地；一致地（侧重众人意见 / 表达统一）例句：The students with one voice agreed to the plan.
