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 believe it when I see it.
我觉得还是眼见为实。
Do I have to go to a hospital?
我应该住院
'Young man,' she answered, 'if you ate more and talked less, we would both enjoy our dinner!
“年轻人，”她回答说，“如果你多吃点，少说点，我们两个都会吃得好的！”