高鐵：bullet train

As a bullet train set out from Xi'an north station to Chengdu, a new high-speed rail line in western China opened, greatly reducing travel time.

The Xi'an-Chengdu high-speed railway links two ancient cities, Xi'an, capital of Northwestern China's Shaanxi province, and Chengdu, the capital of Southwestern China's Sichuan province.

The 658-km line is the first high-speed railway to pass through the Qinling Mountain, the dividing line of China's northern and southern region. The initial operation speed is 250 kilometer per hour.

拆解

1 X, CD? 分別表示 “西安”和“成都”，中國城市名字一般都用拼音縮寫。國外城市，按照發(fā)音寫。

2 V，表示速度。舉一反三，a表示加速度。