One of two equal parts into which sth is or can be divided.
A unit of length based on the width of an expanded hand, usually taken as nine inches.
hectare (ha) 公顷
A unit of surface, or land, measure equal to 100 ares, or 10,000 square meters: equivalent to 2.471 acres.
- US weight
- To assess the weight of (something) by lifting.
- The distance between the lowest and highest points of a person standing upright.
- The distance upward from a given level to a fixed point.
- One half of a sphere.
- One half of the Earth, especially a half north or south of the equator or west or east of the prime meridian: Eastern Hemisphere, Western Hemisphere, Northern Hemisphere, Southern Hemisphere.
A polygon with eleven sides and eleven angles.
A polygon with seven sides and seven angles.
A number system having a base 16; the symbols for the numbers 0–9 are the same as those used in the decimal system, and the numbers 10–15 are usually represented by the letters A–F. The system is used as a convenient way of representing the internal binary code of a computer.
A polygon with six sides and six angles.
highest common factor 最大公因数
Hindu-Arabic Number System 印度 – 阿拉伯数字系统
hour hand 时针
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