【正确答案】There is an old Chinese saying 'if you want to build your wealth, you have to build roads first.' At the turn of the century, the conventional transport system can barely keep up with China's growing demands. That's why the high-speed rail has come at such a crucial time. China began building its high-speed rail network in 2007. In 2009, China opened the world's longest high-speed rail line between Wuhan and Guangzhou. China is home to the largest high-speed rail network in the world. Besides improving traffic efficiency, these high-tech trains are also fast-forwarding China's economy. The rail network is something of a modern-day Silk Road, opening up trade opportunities between China and the rest of the world.