欢迎访问贝贝英语网！
It was a time when people were divided geographically.
Emperor Qinshihuang united the seven major states into one unified country where the Chinese writing system began to develop in one direction.
The first of October, 1949, is the day when (= on which) the Peopled Republic of China was founded.
I'll never forget the time when (= during which) we visited Xi'an.
Do you remember the day when (= on which) we first met?
This is the place where (= at/in which) we first met.
The hotel where (= at/in which) we stayed was very clean.
I recently went back to the town where (= in which) my father was born.
That's the reason why (= for which) he missed his bus.
I didn't get a pay rise, but this wasn't the reason why (= for which) I left.
characteristic意为"特点，特性"，符合题意。specific"具体的，特有的"；character"性格"；nature"本性；自然"。
