Although officially a dependent territory the island is effectively autonomous.是什么意思？

Although officially a dependent territory the island is effectively autonomous.

虽然正式说来这个岛是附属领土,但实际上是自治的.

although

conj. 尽管，虽然，但是，然

例句
He was in love with her, although he did not put that name to it.
他爱着她，虽然他没有将其称为爱。

officially

adv. 官方地，正式地，公务上；

例句
During the Soviet era and its immediate aftermath, the region was officially known as 'Middle Asia and Kazakhstan'.
在苏联时代和紧随其后的一段时期，该地区的官方名称为“中亚和哈萨克斯坦”。

dependent

adj. 依靠的，依赖的，取决于…的，有瘾的；n. 受抚养人，受赡养者，依赖他人者，扈从，侍从；

例句
The local economy is overwhelmingly dependent on oil and gas extraction...
当地经济过于依赖石油和天然气的开采。

territory

n. 领土，版图，领地，领域，范围，[商]势力范围；

例句
He would like an assurance that other forces will not move into the territory that his forces vacate...
他想确保其他势力不会在他的军队撤离后进入这个地区。

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

island

n. 岛，岛屿；vt. 使孤立；

例句
Phillimore Island is named after Sir Robert Phillimore...
菲利莫尔岛以罗伯特·菲利莫尔爵士的名字命名。

is

vt.& vi. 是（be的三单形式；n. 存在；

例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

effectively

adv. 有效地，实际上，事实上；

例句
The border, effectively closed since 1981, will be opened as of January the 1st...
实质上从1981年就已关闭的边境将于1月1日开放。

autonomous

adj. 自治的，有自主权的，[生，植]自发的；

例句
They proudly declared themselves part of a new autonomous province.
他们自豪地宣布成为新自治省的一部分。