Backstopping
支援（backstop的现在分词）
🗣️ 情景例句
Do you get the picture?
明白是怎么回事了吗？
The poor are rich when they are satisfied.
贫能知足即为富。
Lined up against the wall, there were long thin wires attached to metal spheres.
靠墙排列着许多细长的电线，而电线又连着金属球。