Perhaps all the deficiencies have since been rectified. It seems to me there are many things (often more a matter of attitude and perception than the simple memorization of facts) that the schools should teach — things that truly would be useful in later life, useful in making a stronger country and a better world, but useful also in making people happier. Human beings enjoy learning.

问题: but useful also in making people happier 这句话 useful 怎么在 but also 中间，感觉是强调的用法吗？