我们在不同城市同时想到了同一个点子，这真是神奇的同步性。

It was an amazing ___synchronicity that we came up with the same idea at the same time while in different cities.

我们同时想到同一个点子，这种同步性令人惊讶。

The ___synchronicity of us having the same idea at the same time was astonishing.