一分钟学会介词at on in正确用法。 妖精妈妈。 I was born on a Monday，我出生在7月的一个周一。 I was born in the 70s，我出生在70年代。 I was born at 11：00，我出生在一个夏天。 I was born in summer，我出生在英国。 I was born in England，我出生在英国。 days dates on，某天和日期的用on。 decades seasons，年代、季节、国家用in。 times at，具体时间用at。 prepositlons practice，makes_perfect。介词学习熟能生巧。