Jiékèyǔ de fāyīn hěn nán, yí ge cí lǐ chángcháng lián zhe hǎojǐ ge fǔyīn.
Czech pronunciation is hard: a single word often strings several consonants together.
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culture
Czech and 斯洛伐克语 (Slovak) are so close that speakers understand each other. Its letter ř, a rolled r and a zh-like buzz at the same time, is famous as one of the hardest sounds in Europe.