1. The boy´s indifference to his shoolwork was a trouble to his parents.
    这孩子不重视学校功课对他父母来说是个麻烦事。

2. The third major trend is toward an attitude of indifference.
    第三个势头是人们的态度变得越来越无动于衷。

3. After a while, I shrink into a silent indifference, and I don't want to look at the landscape anymore;
    过了一会儿，我蜷缩成一团，一声不吭，对什么都不感兴趣，我再也不想看窗外那些景色了。