Computer translate - How?

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It is easy for a computer to translate single words and short phrases, but not so easy to translate entire documents. Translation is much more than a word-for-word substitution. Most languages are full of ambiguities and words that can be understood only from their context. Dozens of words have two or three meanings, and the grammar of a sentence can also be ambiguous. The sign ‘No electric passenger carrying vehicles beyond this point’ can easily confuse a computer. It cannot tell whether the vehicle or the passenger is electric, or whether the vehicle is carrying the passenger or the passenger carrying the vehicle. What do you think google use to translate laungage? How well do they do it?