B

B¹
(亦作 b)
(pl. Bs 或 B's)

the second letter of the alphabet
英语字母表中第二个字母
■denoting the second of two or more hypothetical people or things
（假设的第二人或第二例）B，乙
■the second highest class of academic mark
（学业成绩）B等，乙等
■(in the UK) denoting secondary road
（英国）第二级公路
the B4248.
4248号二级公路。
B-roads.
二级公路。
■denoting the second-highest-earning socio-economic category for marketing purposes, including intermediate management and professional personnel
（为市场营销而划分的社会经济类别中的）较高收入群体
■(b)(Chess)denoting the second file from the left, as viewed from White's side of the board
(棋)（从执白方左边数过来的）第二列
■(一般作 b)the second fixed constant to appear in an algebraic equation
（代数方程中的）第二已知量
■(Geology)denoting a soil horizon of intermediate depth, typically the subsoil
(地质)（中等深度）土壤层（尤指底土）
■the human blood type (in the ABO system) containing the B antigen and lacking the A
B型血
■(with numeral) denoting a series of international standard paper sizes each twice the area of the next, as B0, B1, B2, B3, B4, etc., B4 being 250 x 353 mm
（国际标准纸张规格）B型号纸（国际标准纸张型号代号，如B0，B1，B2，B3，B4等，每一号的面积是下一号的两倍，B4大小为250x353mm）
(一般 B)(Music)the seventh note of the diatonic scale of C major. (In the German system this note is called H, with B denoting B flat.)
(乐)B音，B调（C大调音阶的第七音，德国体系中该音称为H，B表示降B音）
■a key based on a scale with B as its keynote
B音键

常用词组
plan B

an alternative strategy
替补方案

B²
abbreviation for

Belgium (international vehicle registration)
（国际车辆注册用语）同 Belgium
■bishop (used in recording moves in chess)
［用于记录国际象棋中的步骤］同 bishop
Be5.
第五步。
■black (used in describing grades of pencil lead)
［用于表示铅笔芯软度］同 black
2B pencils.
2B铅笔。
■bomber (in designations of US aircraft types):
［用于标志美国飞机型号］同 bomber
a B52.
一架B52型轰炸机。

symbol for

the chemical element boron
（化学元素）硼
■(Physics)magnetic flux density
(物理)磁感应强度的符号

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