Vacantness
空白, 空虚（vacant的名词形式）
🗣️ 情景例句
And don't forget to invite Susan for dinner.
别忘了请Susan来吃晚餐。
But wouldn't you like to spend an extra day or two here?
你们不愿意在北京多待一天吗？
it was not long before its use as the uniquely recognizable broadcasting frequency for interstellar communication was suggested.
提出把它作为星际间唯一可辨认的广播频率就为期不远了。