相关单词近义词 border 边界, outskirts 郊区, suburb 郊区, circle 圆圈, confines 疆界, constraints 强制, restraints 制约因素, boundary 边界, bound 必定的, frontier 边界, limit 限度临近词bound, bound gas, bound for, bound ray, boundable, bound back, bound acid, bound base, bound atom, bound mode, bound term 返回 bounds