他以贝莱前所未见酷似人类的姿势伸出右手。 贝莱握住他的手，那五根手指坚硬且冰凉。"再见 — — 吉斯卡好友。" 吉斯卡说："再见，以利亚好友。请记住，虽然奥罗拉的原意是曙光女神，可是从现在起，地球才是真正的曙光世界。"} - Isaac Asimov

Connotations and associations; the subtle effect, not of dictionary meaning, but of years of usage; the nature of the sentences and conditions and events in which one has experienced the use of one word as compared with that of the other.

Secrecy as deep as this is past possibility without nonexistence as well.

"Many years later he looked through one of my books and said, "How did you learn all this, Isaac?"
"From you, Pappa", I said.
"From me? I don't know any of this".
"You didn't have to, Pappa", I said. "You valued learning and you taught me to value it. Once I learned to value it, the rest came without trouble.