传统道德和进化一顷不足，提供的原因，他们的行动。

Both conventional morality and evolutionary one are inadequate to provide reasons for their actions.

天空很清澈，但仅仅在一顷刻间里车痕就能被风雪覆盖。

The sky is clear, but the track can become covered with snow in a blink of an eye.