organ

/ˈɔrgən/

a fully differentiated structural and functional unit in an animal that is specialized for some particular function

中文释义：器官

The heart is a vital organ that pumps blood throughout the body.

心脏是泵送血液到全身的重要器官。

Donating organs after death can save multiple lives.

死后捐献器官可以挽救多条生命。