The tracks that every train enters and exits stations are built up downhill and uphill to reduce the subway operation costs.
每辆地铁在出站时轨道都是下坡的，进站时的轨道都是上坡的，这样的设计可以降低运营成本。
The tracks that every train enters and exits stations are built up downhill and uphill to reduce the subway operation costs.
每辆地铁在出站时轨道都是下坡的，进站时的轨道都是上坡的，这样的设计可以降低运营成本。
应用推荐