这种极性的变化导致列车前方牵引列车前进的电磁场，同时列车后面的电磁场加上了更多的向前推力。

This change in polarity causes the magnetic field in front of the train to pull the vehicle forward, while the magnetic field behind the train adds more forward thrust.

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欢迎您乘坐长春地铁二号线列车，列车前方是本次车的终点站彩虹广场站感谢您乘坐长春地铁二号线列车，下次乘车再见。

We are arriving at Rainbow Square, thank you for taking Changchun Subway. Welcome to take this line on your next trip, have a nice day.

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每个包间都配有一台小收音机，列车员告诉我们最好把收音机打开着，因为除了播放当地的音乐，收音机还会报告列车前方到达的车站。

All compartments boast a small radio, which we're encouraged to leave on, for it offers announcements about forthcoming stops as well as local music.

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