2019屆高考英語介詞用法復習
at a good price 高價
at a low cost 低成本
at a great cost 花了很大代價
at that time 在當時
evaporation takes place at all tempertures. 蒸發在任何溫度下都能發生。
at 1000rpm (revolution per minute) 每分鐘1000轉
at a high speed 高速
the soldiers launched an attack upon the enemy at sunset. 戰士們在日落時對敵人發起了攻擊。
at daybreak 日出時
the force at the core leading our cause forward is the chinese communist party. 領導我們事業的核心力量是中國共產黨。
the atom has a nucleus at its core. 在原子的中心有一個原于核。
at the beginning of this term the teacher in charge of our class was very strict with us. 這學期開始，我們的班主任老師對我們要求非常嚴格。