Mouths opened and remained open.

　　嘴張著(zhù)，一直張著(zhù)。

　　No lie was found in their mouths.

　　在他們口中察不出謊言來(lái)。

　　We use our mouths to eat and talk.

　　我們用嘴吃東西和講話(huà)。

　　They opened their mouths.

　　他們張開(kāi)了嘴巴。

　　They are hippo's mouths.

　　這些是河馬的嘴巴。