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
in the conference room.
在会议室。
Can you really judge his thoughts by his word?
你真的能从言语判断他的想法吗？
Then the sound of rumbling thunder reached the watchers on the shore, as cargo, ballast,
岸上的观众听到船上发出了雷鸣般的轰响。当物品、压舱物、