B 开头单词
be my guest 别客气，请用；请便
be mutinous in one's heart 心中不服
be much the same 相伯仲
be much embarrassed 尴尬异常
be much concerned about sth 对……非常担忧 非常关心某事
be moved to tears 感动得流出眼泪
be moved 被感动
be motivated purely by self-interest 一己为私
be most willing to 心甘情愿 毫不勉强 毫不委屈
be mortally afraid of death [语言学]贪生怕死
be mortally afraid 心惊肉颤
be more than enough 绰绰有余
be more specific 详细点 更具体
be more exact 更确切地（说）