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
Is anybody hungry?
有人饿了吗？
An honest man's word is as good as his bond.
诚实人的话像他的契约一样靠得住。
We swam and dived off the rocks into the sea.
我们从岩石上跳进海里游泳。