zài / mò / shēng / rén / miàn / qián / tā / zǒng / shì / suō / shǒu / suō / jiǎo / bù / gǎn / zhǔ / dòng / fā / yán

在陌生人面前，他总是缩手缩脚，不敢主动发言。

In front of strangers, he always acts timidly and dares not speak up.