151.不同之处：difference
152.不修边幅：be slack about one’s appearance
153.不虚此行：be journey has not been made in vain
154.不宣而战：open hostilities without declaring war
155.不学无术：ignorant and incompetent
156.不一而足：not just once but on numerous occasions; by no means rare
157.不遗余力：spare o effort; stint no effort
158.不以物喜，不以己悲：not pleased by external gains, not saddened by personal losses
159.不义之财：ill-gotten wealth/gains
160.不亦乐乎：isn’t it a great pleasure?
161.不翼而飞：disappear unexpectedly; spread fast
162.不由分说：allowing no explanation
163.不由自主：cannot help doing sth; involuntarily
164.不远千里：make light of travelling a thousand li; make light of travelling from afar
165.不约而同：take identical action or share identical views without previous consultation
166.不在话下：be nothing difficult, be a cinch
167.不在其位，不谋其政：He who holds no rank in a state does not discuss its policies
168.不择手段：use any device, by any means
169.不折不扣：hundred per cent, to the letter, out and out
170.不正之风：unhealthy tendency, improper practice, malpractice
171.不知不觉：unconsciously, before one knows
172.不知凡几：innumerable, countless
173.不知好歹：can’t tell good from bad, not know what’s good for one
174.不知所措：be at one’s wit’s end, be quite lost, be bewildered
175.不知所云：can’t make out what is meant
176.不知所终：not know where sb. Spent the last years of his life
177.不知天高地厚：not know the height of the heavens or the depth of the earth—have an exaggerated opinion of one’s abilities
178.不知羞耻：have the effrontery to
179.不值一钱：not worth a penny, utterly worthless, mere trash
180.不治之症：incurable disease
181.不置可否：not say anything definite, make no comment
182.不着边际：wild
183.不自由，毋宁死：Give me liberty, or give me death.
184.不足挂齿：not worth mentioning, not worth taking seriously, nothing to speak of
185.不足为奇：small wonder
186.不足为训：not to be taken as an example
187.不足为外人道：This is not be mentioned to outsiders. This is strictly between ourselves.
188.不足为谋：not worth consulting with
189.不足之处：drawback, disadvantage
190.不做声：silent
191.步步高升：promoting to a higher position
192.步履蹒跚：with infirm steps
193.步履艰难：with infirm steps
194.步入后尘：follow in sb’s footsteps, follow upon sb’s hells, trail along
195.部优产品：ministry prize product
