A dependency is a country which is controlled by another country.
例句
...the tiny British dependency of Montserrat in the eastern Caribbean.位于加勒比海東部巴掌大的英國附屬領地蒙特塞拉特
N-UNCOUNT
（尤指過分或不利的）依靠，依賴
You talk about someone's dependency when they have a deep emotional, physical, or financial need for a particular person or thing, especially one that you consider excessive or undesirable.
例句
We worried about his dependency on his mother...我們擔心他可能對母親太過依賴。Ukraine is handicapped by its near-total dependency on Russian oil.烏克蘭受制于對俄羅斯石油近乎完全的依賴。
N-VAR
(對酒精、毒品等的)依賴，癮，癖
If you talk about alcohol dependency or chemical dependency, you are referring to a situation where someone is an alcoholic or is addicted to drugs.
例句
In 1985, he began to show signs of alcohol and drug dependency...在1985年，他開始表現出酗酒嗜毒的跡象。In 1979 she quit her teaching job because her dependency had affected her work.她于1979 年辭去了教書一職，因為她的癮癥已經影響到了工作。