### 成员变量

类型: String

#### # static readonly acres

AreaUnits.acres，英亩

Default Value:
  - 'acres'

类型: String

#### # static readonly ares

AreaUnits.ares，公亩

Default Value:
  - 'ares'

类型: String

#### # static readonly hectares

AreaUnits.hectares，公顷

Default Value:
  - 'hectares'

类型: String

#### # static readonly squareFeet

AreaUnits.squareFeet，平方英尺

Default Value:
  - 'square-feet'

类型: String

#### # static readonly squareKilometers

AreaUnits.squareKilometers，平方千米

Default Value:
  - 'square-kilometers'

类型: String

#### # static readonly squareMeters

AreaUnits.squareMeters，平方米

Default Value:
  - 'square-meters'

类型: String

#### # static readonly squareMiles

AreaUnits.squareMiles，平方英里

Default Value:
  - 'square-miles'

类型: String

#### # static readonly squareYards

AreaUnits.squareYards，平方码

Default Value:
  - 'square-yards'