he spent most of his spare time reading book on low有何错误打错了 是on law
问题描述：
he spent most of his spare time reading book on low有何错误
打错了 是on law
答
he spent most of his spare time on reading book about law
答
low---->law
He spent most of his spare time (in) reading book on law.
那就没错了~O(∩_∩)O~
答
books on law