At any instant a collision could have occurred that would have been fatal to us.

时时刻刻，都有可能给我们致命的打击。

She awaits a devoted man who may return at any instant.

她等待一个随时可能回来的忠诚男人。

When we think of a given particle, we inherently " know" that it exists in a single place at any instant in time.

当我们想到一个给定的粒子时，我们天生就“知道”它存在于任何时刻的单一地点。