A cold and reserved young man who wields a spear known as Cloud-Piercer. He acts as the Express' guard on its long trailblazing expedition.
清冷寡言的少年，持有名为「击云」的长枪，于列车漫长的开拓之旅中担任护卫。
*清冷寡言的 cold and reserved。
*长枪 spear。使用武器用wield，比如持剑 wield a sword。
*击云 Cloud-Piercer。字面意思为云-穿孔机。
*开拓之旅 trailblazing expedition
Dan Heng never talks much about his past. In fact, he joined the Express Crew to escape from a past of his own making.
丹恒对自己的过往始终讳莫如深，他与列车同行正是为了摆脱自己曾亲手造就的一切。
*讳莫如深 talks much about 。或者也可以用closely guard a secret，unduly reticent on the subject of等等。
But can the Express really help him outrun his past?
然而，列车真的会带着他远离「过去」么？
*远离 outrun。英文释义为to run faster or further than sb/sth 跑得比…快（或远）；超过。
突然觉得这里很有深意，每个人都有可能为自己的过去后悔，只有勇敢努力地前进，才能outrun自己的过去。
词汇复习：
reserved 寡言少语的，内敛的
spear 长枪
Piercer 穿孔机
expedition 远征，考察
closely guard a secret 讳莫如深
outrun 超过