0.5kilometers?

0.5千米

你要解释什么，要翻译吗？

不就是0.5公里啊~!
还要解释什么啊!~
不需要~!

0.5公里。
以下为公里介绍
The kilometre (American spelling: kilometer), symbol km[1] is a unit of length in the metric system, equal to one thousand metres.

Slang terms for kilometre include click (sometimes spelled klick or klik) and kay (or k).

Pronunciation
There are two different pronunciations for the word:

/ˈkɪl.əˌmiː.tə(r)/ and
/kɪˈlɒm.ə.tə(r)/.
The former pronunciation follows the general pattern in English whereby metric units of measurement are pronounced with the stress on the first syllable, and preserves the correct pronunciation of metre. However, the latter pronunciation, which follows the stress pattern used for the names of measuring instruments (such as micrometer, barometer, thermometer, tachometer and speedometer), is in common usage. Kingsley Amis has suggested that this pronunciation