Carrying tons of wheat, this train crosses over the border at midnight.

这列载有数吨小麦的火车在午夜时分通过边界。

The reason the Quadrantids peak is so short is because of the shower's thin stream of particles, coupled with the fact that Earth crosses the stream at a perpendicular angle, the agency explains on its website.

象限仪座流星雨的峰值如此短的原因是因为流星雨的细流粒子流，再加上地球以垂直角度穿过粒子流这一事实。