Outer boundary
外边界
🧩 词语组成解析
outer
['aʊtɚ]
adj. 外面的，外部的;远离内部（中心）的;[哲]客观外界的，物质的;
n. 环外命中;
🗣️ 情景例句
Robbie, let's call them. Robbie
Robbie，我们给他们打电话，Robbie。
Thank you for a very enjoyable evening.
谢谢你，今晚过得真愉快。
Sometimes, my grandma decides to buy one big birthday present for both of us.
有时，奶奶决定给我俩就买一件大生日礼物。