In plane Cartesian coordinates, the x-coordinate of a point: its position from the origin (y axis) measured parallel to the x-axis.
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.
Having the same size and shape.
decimal number system 十进制数字系统
A positional system of numeration that uses decimal digits and a base of ten.
The act or process of separating an equation, formula, cryptogram, etc., into its component parts.
24 = 2 * 3 * 4
ax + ay + bx + by = (a + b) (x + y)
geometric sequence 等比数列
A series of numbers in which each is multiplied by a fixed number to produce the next. Like:
1, 2, 4, 8, 16 … …
1, 0.1, 0.01, 0.001, 0.0001 … …
A conic section formed by a point that moves in a plane so that the difference in its distance from two fixed points in the plane remains constant.
| M1F1 | – | M1F2 | = | M2F1 | – | M2F2 | = | M3F1 | – | M3F2 | = …… = Constant
number system 数制
Any system of naming or representing numbers, as the decimal system or the binary system.
- if 条件句、if only的虚拟语气
- There be 句型