界标bb: BB = Bachelor of Business 商学 ...boundary: n. 边界,疆界,限界 (between);(球场)边线 ...beacon: n. 1.(作为信号的)烽火,篝火。 2.信号所,望楼; ...boundary beacon: 边界标志boundary marker beacon: 场界指点标下载手机词典可随时随地查词查翻译