Boundary relation
[化] 边值关系
🧩 词语组成解析
🗣️ 情景例句
No, thank you. It's too late. I really have to go.
不，谢谢。太晚了，我真的该走了。
There's many a good tune played on an old fiddle.
老当益壮。
I go to school by bike every day.
我每天骑自行车上学。