Backstopping
支援（backstop的现在分词）
🗣️ 情景例句
No sweat.
小事儿。
I heard you.
我听到了啦。
Imagine their surprise and delight when they broke open the packing cases and found that the fourth engine was sweet as honey -- still in perfect condition.
想一想他们所感受到的惊奇和兴奋 —— 当他们拆开包装箱时，他们发现第4台发动机就像蜂蜜一样甜 —— 发动机完好无损。