我欣赏她的冒险精神。

Wǒ xīnshǎng tā de màoxiǎn jīngshén.

I admire her adventurous spirit.

我怀疑他精神有问题。

Wǒ huáiyí tā jīngshén yǒu wèntí.

I suspect he has mental health issues.

他看起来很精神，肯定休息好了。

Tā kàn qǐlái hěn jīngshén, kěndìng xiūxi hǎo le.

He looks energetic, he must have rested well.