Looking at the current demand in the top 2 economies and the sheer population size, I am bullish on Duolingo!
There is no good way to learn languages besides practice, practice and practice. Being immerse in the environment of the language is definitely needed. This environment for mandarin in Singapore is not great and many use them only in schools or simple daily use. Very few would consider themselves expert in the language.
I definitely use translation tools when I travel. Traveling is for relaxation. Time is too short and too tedious to learn a new language.
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