bank out的用法和樣例：
例句
- They banked out the coal in default of means for removing it.
他們因缺少搬運工具而把開出的煤堆起來。 - A closer view reveals that the skyscrapers are all constructed out of garbage, neatly compacted into squares or bales and piled on top of one another.
鏡頭拉近，看到這些高樓其實是堆起來的垃圾，整齊地壓成方形，一個壓一個地高高堆著。
