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
we don't have to.
我们不必勉强。
I agree. I wish it were cheaper.
是这肃，我真希望它能便宜点。
Some of us do not know much about the theatre.
我们中有些人还不太懂戏剧。