three quarters of a century是什么意思

three quarters of a century是什么意思 three quarters of all Americans是什么意思? three-quarters of an three-quarters of abillion是多少? for three quarters of an three full quarters是什么意思啊 three quarters of a million or one and three quarter million lf half of a number is 30,then three-quarters of it is____.A three quarters of用什么提问 three quarters of the mountain__with trees three quarters of the earth is water Three quarters of rue USA___with forest.