Library science
n. 图书馆（管理）学
🧩 词语组成解析
🗣️ 情景例句
I know you didn't expect to have me around,
我知道你没有预期我出现在你身边，
We've only sold our product at trade fairs, not in an on-going sales campaign.
我们的产品只在商展时展售，而没有办促销活动。
let alone distances of tens or hundreds of light years.
更不用说几十光年或几百光年远的地方了。