Tactfulness
n. 灵活机智（tactful的名词形式）
✅ 同义词
🔴 反义词
🗣️ 情景例句
What does that mean in plain English?
你能不能用大白话解释一下？
Keep some till more come.
更多的到手以前，要保持手里的一点。
that a series of deep soundings was obtained in the Atlantic and the first samples were collected by dredging the bottom.
才在大西洋测得一个个海水深度，同时通过挖掘海底，取得了研究海底的首批样品。