Pipeclay
（造烟管或皮革用的）白黏土, <喻>（军队对服装等的）严格要求
📖 牛津释义
pipeclay
n [U] fine white clay used (esp formerly) for making tobacco pipes and for whitening leather, etc 白陶土（尤於旧时用以制烟斗、 使皮革增白等）.
🗣️ 情景例句
If you don't think it's any good, Please say so.
如果你认为写得不好，请照实说。
I can't be sure of my future plans.
我还没有明白地定下我将来的计划。
so vast is the number of planets,
但是行星的数目是那么庞大，