### 成员变量

类型: String

#### # static readonly degrees

RadiusUnit.degrees，度

Default Value:
  - 'degrees'

类型: String

#### # static readonly kilometers

RadiusUnit.kilometers，千米

Default Value:
  - 'kilometers'

类型: String

#### # static readonly meters

RadiusUnit.meters，米

Default Value:
  - 'meters'

类型: String

#### # static readonly miles

RadiusUnit.miles，英里

Default Value:
  - 'miles'

类型: String

#### # static readonly nauticalMiles

RadiusUnit.nauticalMiles 海里

Default Value:
  - 'nautical-miles'

类型: String

#### # static readonly yards

RadiusUnit.yards，码

Default Value:
  - 'yards'