n. 石头;宝石;矿石;(膀胱或肾脏中的)结石;
vt. 向扔石块;用石头铺;以石掷向;除(水果的)硬核;
adj. 石制的;石头似的;[S-]石器时代的;粗陶制的;
adv. 石一般的;
🗣️ 情景例句
What's wrong, Susan?
怎么啦, Susan?
He reads a book every day.
他每天都读一本书。
But here we come up against the most difficult of all obstacles to contact with people on other planets ----the astronomical distances which separate us.