His popularity spread across the country in an instant.

His popularity increased in the blink of an eye.

The train will arrive soon.

Understanding the concept of 'Ha-line conversion sounds' is important in learning Japanese.

Among my family, I am the tallest.

The International Phonetic Alphabet is an essential tool for linguistic research.

This speech synthesizer generates very high-quality voices.

A back vowel is a sound where the back of the tongue approaches the palate.

Back vowels are vowels that are pronounced using the back of the tongue.

Front vowels are pronounced using the front part of the tongue.