乌敏岛 meaning in English

pulau ubin
ubin pulau

It is situated to the north - east of the main island
这些岸外岛屿之中,最大的是乌敏岛
The biggest of these off - shore islands is pulau ubin
这些岸外岛屿之中,最大的是乌敏岛
Pulau ubin was once of great value to the main island of singapore because of a particular item it had to offer . what was that item
乌敏岛曾因提供某项东西而对新加坡本岛有很大贡献。是什么东西？