Firming
vt.& vi. 使坚固（firm的现在分词形式）
🗣️ 情景例句
doing a commercial.
正在做广告。
I look forward to receiving your reply.
我期待着你的答复。
The towers are further apart at the top than at the base, but this is no mistake.
两座塔楼的楼顶之间的距离比楼底之间的距离要大一些，但是这并不是错误。