英语中用at还是in

如题所述

at黎明、午、夜、点与分
  例: at dawn, at daybreak 在黎明时候
  at noon 在中午
  at night 在夜间
  at midnight 在午夜
  以上短语都不用冠词
  at six o'clock 在6点钟
  at 7:30 (seven thirty) 在7点半
  at half past eleven 在11点半
  at nine fifteen 在9点15分
  at ten thirty a.m. 在上午10点30分
  也可以写成
  seven to five 5点差7分(半小时以上)
  five minutes after two 2点过5分
  at a quarter to two 1点45分
  at the weekend 在周末
小处at大处in
  例:Li and I arrived at Heishan county safe and sound, all is well. Don't worry. 李和我平安地到达黑山县,一切很好,勿念。
  I live in a great city (big city), my sister lives at a small town while my parents live at a village. 我住在大城市,我姐姐住在一个小城镇,而我的父母则住在农村。
  I'm in Liaoning, at Anshan. 我住在辽宁省鞍山市.
at山脚、门口在当前,速、温、日落价核心
  即在山脚下、在门口、在目前,速度、以……速率、温度、在日落时、在……核心要用at。
  例:At the foot of the mountain, there are thirty of our comrades. 在山脚下,有我们30个同志。
  There is a beautiful lake at the foot of the hill. 山脚下有一个美丽的湖。
  At the gate of the house there are many children playing glassball. 门口有一大群孩子在玩玻璃球。
  Who's standing there at the door? 谁站在门口?
  I don't need the dictionary at present. 我现在还不需要这本词典。
  He is at present in Washington. 他目前正在华盛顿。
  The train runs at fifty kilometres an hour. 火车每小时行驶50公里。
  we built the plant at top speed and minimun cost. 我们以最低的投资,最高的速度修建了该工厂。
  at home 在国内,在家里
  at ten degrees centigrade 在摄氏10度
  at minus ten degrees centigrade 摄氏零下10度
  Water freezes at 0°centigrade. 水在镊氏零度结冰。
  Water usually boils at 100°. 水通常在摄氏loo度沸赐。
  at zero 在零度
  at the rate of 45 miles an hour
  at full speed 全速
  at a good price 高价
  at a low cost 低成本
  at a great cost 花了很大代价
  at that time 在当时
  Evaporation takes place at all tempertures. 蒸发在任何温度下都能发生。
  at 1000RPM (revolution per minute) 每分钟1000转
  at a high speed 高速
  The soldiers launched an attack upon the enemy at sunset. 战士们在日落时对敌人发起了攻击。
  at daybreak 日出时
  The force at the core leading our cause forward is the Chinese Communist Party. 领导我们事业的核心力量是中国共产党。
  The atom has a nucleus at its core. 在原子的中心有一个原于核。
  At the beginning of this term the teacher in charge of our class was very strict
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