提示：点击例句中的单词，就可以看到词义解释

But these are usually very expensive .

但这些通常是非常昂贵。

The results are usually qualitative rather than quantitative .

结果常常注重质量的而不是数量。

The biggest joys in life are usually free .

生命中最大的欢乐往往是免费的。

As opposed to black white usually has a positive connotation .

与黑色不同，白色常有肯定的含义。

D : what lind of cases usually provokes your attacks ?

医生：平常在什么情况容易引起您的病发作？