短语讲解：
1. China's high speed trains rolling off a bridge like toys.
roll off滚落下来
例句：Her baby rolled off the bed this morning.
她的婴儿今天早晨从床上滚了下来。
2. He was vice president of sina.com, helping it grow into one of the most popular websites in China.
grow into成长为…
例句：The small shop grew into a large firm.
那个小店发展成为一家大公司。
3. If you look at the time when the internet was first introduced in China, and I was there, and it really introduced a level of information that was just not available before.
