他穿着一身黑色西装，看起来很庄重。

Tā chuānzhe yì shēn hēisè xīzhuāng, kànqǐlái hěn zhuāngzhòng.

Wearing a black suit, he looked very dignified.

在这样的场合，你的态度需要更庄重一些。

Zài zhèyàng de chǎnghé, nǐ de tàidu xūyào gèng zhuāngzhòng yìxiē.

In this kind of setting, your attitude needs to be more solemn.