動詞 slip away:

1. leave furtively and stealthily
   同義詞：steal away, sneak away, sneak off, sneak out
2. pass by
   同義詞：elapse, lapse, pass, slip by, glide by, go by, slide by, go along

1. Moon's weak gravity let the gasses slip away into space.
   月球的微弱引力允許氣體逃到太空里去。
2. Aha, you can't slip away this time.
   哈哈，這回你溜不掉了。
3. I saw the boy slip away through the door.
   我看見那個男孩溜出門去。