n.

1. 单位；单元[C]
   The hour is a unit of time.

   小时是时间单位。

   The family is a social unit.

   家庭是一个社会单元。

2. （全体中的）一个，一员[C]
   We regard husband and wife as the primary units of the family.

   我们把夫妻视为家庭的基本成员。

3. （设备等的）一套，一组；装置[C]
   I'm thinking of buying a hi-fi unit.

   我正在考虑买一套高保真音响设备。

4. （常构成合成词）组合件，组件[C]
   There is something wrong with the power unit of my computer.

   我的电脑电源出了毛病。

5. 组，分队；部队[C][G]
   Small guerilla units were fighting behind enemy lines.

   游击小分队在敌人后方作战。

6. 【数】最小整数；个位数[C]
7. 【美】教学单元[C]

n.

1. an individual thing or person regarded as single and complete but also able to form a individual component of a larger whole.
   ▸a self-contained section of a building or group of buildings.
   ▸a subdivision of a larger military grouping.
   ▸a self-contained part of an educational course.
   ▸a single manufactured item.
2. a device or part with a specified function.
3. a standard quantity in terms of which other quantities may be expressed.
4. one as a number or quantity.