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
Thank you very much, But I guess I'd better do it myself.
谢谢你，但我想我最好还是自己做。
You had better wash those dirty clothes.
你该去把那些脏衣服洗一洗。
Half the world's telephone calls are made in English.
全球1/2的电话是用英语打的。