D-layer
n. D层（电离层的最下层）
🧩 词语组成解析
layer
['leiə]
n. 层，层次;膜;[植]压条;放置者，计划者;
vt. 把…分层堆放;借助压条法;生根繁殖;将（头发）剪成不同层次;
vi. 形成或分成层次;[植]通过压条法而生根;
🗣️ 情景例句
I'll set up an appointment with the marketing people.
我会与行销部的人安排一次会谈。
When in doubt, play trumps.
举棋苟不定，何妨将一军。
The intellectual, who is working on some abstruse problem, has everything coordinated and organized for the matter in hand.
一个专心钻研某个复杂问题的知识分子，为了搞好手头的研究，要把一切都协调一致，组织周密。