train [treɪn] n. 火车

英英解释（牛津词典）：

a railway/railroad engine pulling a number of coaches/cars or trucks, taking people and goods from one place to another

train的特点：

• 一种铁路引擎牵动着数个车厢（a railway/railroad engine pulling a number of coaches/cars or trucks）
• 载着人活着货物从一个地方到另一个地方（taking people and goods from one place to another）