Word: 光滑 (guānghuá)

在光滑的路上开车会导致车祸。

Zài guānghuá de lùshang kāichē huì dǎozhì chēhuò.

Driving on a slippery road can lead to a car wreck.

地球比台球更光滑。

Dìqiú bǐ táiqiú gèng guānghuá.

The Earth is smoother than a billiard ball.

她的皮肤光滑。

Tā de pífū guānghuá.

Her skin is smooth.

它像婴儿的屁股一样光滑。

Tā xiàng yīng'ér de pìgu yíyàng guānghuá.

It's as smooth as a baby's bottom.