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One of the most interesting things about Arabic is the absense of sounds which are common almost everywhere else and the presence of consonants missing from other languages.
Arabic lacks the sounds 'p' (پ in Urdu), 'g' (گ) and 'ch' (چ) which are commonly found in other languages, even derived ones such as Urdu. On the other hand, the exact pronunciations of 'dzal' (ذ), 'duad' (ض), 'dzoi' (ظ), 'tse' (ث), 'toi' (ط) are missing from most others.
The strange thing is, Arabic doesn't share this behaviour with its other relatives such as Hebrew. Would be interesting to find out how this happened.