for与in 在表达时间上的区别
for可以表示一段时间,
但是下面的2个有什么区别呢?
for 1970
in 1970
●28.The United States census for 1970 showed that the French-speaking residents of Louisiana were one of the country’s most compact regional linguistic minorities.
for后面就跟了时间点
in 1970是很普通的用法