Boundary layer
[计] 边界层\\n[化] 边界层
🧩 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 woke up when I heard someone speak.
一听到有人说话我就醒了。
Will you speak up, please?
请你大声一点好吗？
The characters on the paper were white, and the rest of the paper was black.
纸上的汉字呈白色，其余部分成黑色。