101.before long 不久以后

102.behind schedule 误点

103.bent on sth.下定决心做…

104.beside point 离题的,不相干的

105.beyond one's ability超越某人的能力

106.beyond question 毫无疑问

107.book on reserve 须留的图书

108.booked up 订完了

109.bound for开往

110.break down抛锚

111.break though突破

112.break up with和某人分手be through with/be finished with

113.bring about 使…发生

114.bring someone up to date帮某人赶上help someone catch up

115.by accident 偶然

116.by air 根据航空途径

117.by all means 尽一切方法,务必

118.by and by 不久,迟早

119.by chance 偶然,碰巧

120.by far 比较,...得多