I. Fiona Fang

1, interpretation

(1) The area description term refers to an area within a certain radius.

(2) around, around.

(3) scope; Nearby.

(4) planning; raise funds

(5) as the case may be; Flexible.

Step 2 quote

Guo Xiaochuan wrote in his poem "How Steel was Tempered": "The factory land in Fiona Fang is covered with lush weeds."

Second, kilometers

1, interpretation

Refers to kilometers, which is expressed in English as km (kilometers).

2. Source

1790 in may, a special committee composed of French scientists took one tenth of the total length of the earth meridian passing through Paris as the unit of length-meter,1km =10000 m =10000 decimeter = 10000 cm.

Extended data

Common length unit:

Commonly used length units are millimeter (mm), centimeter (cm), decimeter (dm), kilometer (km), meter (m), micron (micron), nanometer (nm) and so on.

In the international system of units, the standard unit of length is "meter", which is represented by the symbol "m". 1960 The 1st International Metrology Conference: "The length of the meter is equal to 1650763.73 times of the radiation wavelength passing between 2P 10 and 5d 1 levels of krypton -86 atoms in vacuum".