My initial reaction was to decline the offer.

我最初的反应是要婉言谢绝这个提议。

The initial reaction has been excellent.

最初的反应极好。

That's my initial reaction.

那是我的第一反应。

Initial reaction from outside was icy.

外界的第一反应是冷冰冰的。

His initial reaction was one of shock.

他最初的反应是震惊。