balance n. 平衡 v. 平衡
basic adj. 基础的；base n. 基础
benefit n.&v. 益处，有益于
believe v. 相信；belief n. 信念
belong v. 属于 belong to
blame v. 责备
bother v. 打扰
break v. 打破（broke broken）break down 出故障
breath n. 呼吸；breathe v. 呼吸
burden n. 负担