back up 后退，支持; base on 基于 be able to能夠，勝任 be about to正打算 be accustomed to習慣于 be associated with 與……有關，與……有關系 be aware of 意識到; be capable of 有能力干; be caught 遇到，陷入 be committed to被交給┄,答應承擔┄義務; be confined to 限制在,局限于; be confined/be restricted受……限制 be dedicated to 奉獻,獻給; be devoted to 被用于，貢獻給 be directed to指向，針對 be drawn to 被┄所吸引; be due to由于，因此 be exposed to 暴露在┄下,處在┄的作用之下; be fond of 喜愛 be full of 充滿他 be habitual to(him) 對(他來說)習以為常 be in order合適，恰當。 be involved in 參與，參加; be involved with 與……有關連， be left to 由┄來決定,由┄來想辦法; be limited to限制在┄,限定在┄; be linked to/with something 與……連接 be proud of 為~而驕傲。 be referred to被提及，被提交 be related to與……有關 be sick of 厭惡┄,討厭┄; be subject to 經(jīng)受,遭受; be suitable for適合于 be sure of 對┄的肯定; be thrown in 額外贈送 be tied by/with被……捆綁 be tied to 束縛于，捆綁于 be tired of 厭倦┄,厭煩┄; behind time 晚點 belief in對……的真實性或正確性具有的信心 believe(… to be) 相信……是 better than好于…… beyond question毋庸置疑 break away脫離，逃跑 break down 損壞，分解，瓦解 break into闖入 break in強行進行，打斷 break off斷絕，結束 break out突發(fā)，爆發(fā) break through突破 break up終止，結束，打碎 bring about 產(chǎn)生; bring forward 提出。 bring out 使出現(xiàn);公布;出版; bring up 培養(yǎng)，養(yǎng)大; by accident偶然，含有不幸的因素 by all means無論如何，必定 by chance偶然，意外地 by choice處于選擇 by contrast 對比之下; by means of 用，依靠; 借助于 by means of借助于 by mistake錯誤地 by the way順便提一下 by virtue of 憑借，借助;因為， by way of經(jīng)由，通過…方式