But quakes may often be felt in levelcountry, too, because the waves which come from the center of a quake run often for thousands of miles.
但是，平原国家也会经常感觉到地震，因为从震源发出的震波往往可以传出上千里。
2
The US has always been a remarkably mobile country, but new data from the Census Bureau indicate that mobility has reached its lowest level in recorded history.
On a societal level, one could even imagine that a lack of conversational flow may hamper the integration of immigrants who have not completely mastered the language of their new country yet.