面对突如其来的问题，他显得茫然无措。

miàn duì tūrúqílái de wèntí, tā xiǎnde máng rán wú cuò.

Faced with the sudden problem, he appeared confused and at a loss.

在陌生的城市里，他感到茫然不知所措。

zài mòshēng de chéngshì lǐ, tā gǎndào máng rán bù zhī suǒ cuò.

In the unfamiliar city, he felt lost and didn't know what to do.

毕业后突然找不到方向，他感到十分茫然。

Bìyè hòu tūrán zhǎobudào fāngxiàng, tā gǎndào shífēn mángrán.

After graduation, suddenly unable to find a direction, he felt very lost.