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Safety is key to railway system. ** New version released for High Speed Calculation!Railway signalling is a system used to control railway traffic saf …

International Phonetic Alphabet (IPA) is an alphabetic system of phonetic notation. It is important for every one who learns a new language. This appl …

Safety is key to railway system.Railway signalling is a system used to control railway traffic safety to prevent trains from colliding. The calculatio …

Putonghua is undoubtedly one of the most popular language in the world nowadays. This introductory application contains all 23Pinyin initials and 34 f …