B. u.
[医] 棱底向上
🧩 词语组成解析
[医] 单位
🗣️ 情景例句
Like setting up a regular weekly reading program.
譬如说开办一项每周一次的定期阅读计划。
One has lived too near a wood to be frightened by owls.
深知底蕴，不以为怪。
Life on a desert island is wretched.
认为荒岛生活很可怕，