✔ 最佳答案
I think you are misinterpreting a sound you hear.
The most common meaning of "able to move" is pronounced "mo-bull" (in the US) as somebody said. It isn't "bo". There is an "l" sound in there. This is the same sound as the "ble" sound on many English words (noble, able, notable, teachable).
In the UK, I think this is pronounced "mo-byle" with a long "i". I think that's what you're interpreting as "mo-by-oh", but there is an "l" sound in there again that you are missing.
There is another meaning for a kind of balanced sculpture, such as the work of Alexander Calder.
http://calder.org/work/category/hangingmobile.html
This is pronounced "mo-beel". Again, there is an "l" sound at the end there.