1. The situation had rapidly deteriorated.
    局势很快恶化了。

1. 迅速地：rapidity 迅速 | rapidly 迅速地 | rapt 狂喜的

2. rapidly的意思

2. 迅速：demand=需求; | rapidly=迅速; | outstrip=超过;

3. 迅速地(状语)：was sinking 正在下沉(谓语,一般过去进行时态) | rapidly迅速地(状语) | for five of her sixteen watertight compartments had already been flooded!(状语从句)

4.

4. 很快地：Perpetual永久的 | Rapidly很快地 | Degradation下降

1. with rapid movements

    e.g. he works quickly

    Synonym: quicklyspeedilychop-chopapace