Research workers are well aware that much of their time and effort is unproductive.
研究人员很清楚,他们的很多时间和精力全都是白费。
...increasingly unproductive land.
越来越贫瘠的土地
👨🏻🏫 Mr. Ng 柯林斯詞典 📚 – collins.mister5️⃣.net切換為繁體中文