玄数

balance   平衡
A situation in which different things exist in equal, correct or good amounts.balance scales   天平
An instrument for weighing things, with a bar that is supported in the middle and has dishes hanging from each end.

bar chart / bar graph  条形图
A diagram that uses lines or narrow rectangles(= bars) of different heights (but equal widths) to show different amounts, so that they can be compared.

base   底面； 根

• The line or surface forming the part of a figure that is most nearly horizontal or on which it is supposed to stand.
• The number that is raised to various powers to generate the principal counting units of a number system. Thebase of the decimal system.
  
  
• The number raised to the logarithm of a designated number in order to produce that designated number; the number at which a chosen logarithmic scale has the value 1.

base ten system   十进制数字系统

12345 = 1×10⁵ + 2×10⁴ + 3×10³ + 4×10² + 5×10⁰

391.47 = 3×10³ + 9×10² + 1×10⁰ + 4×10^–1 + 7×10^–2

benchmark angles   基准角
Angles such as 45°, 90°, 180°, 270° … , that can be used as references.

billion   十亿
One thousand million: 1 000 000 000, 10⁹.

binary   二进制
Relating to a system of numerical notation to the base 2, in which each place of a number, expressed as 0 or 1, corresponds to a power of 2.

100₂（100B）、             11010.11₂（11010.11B）
7 = 2² + 2¹ + 2⁰
9 = 2³ + 0 + 0 + 2⁰

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