an echo
An echo. It is a reflection of sound that can only be heard, and it repeats what is spoken to it.
echo
Crazanian is not a real language but a mountweasel. A mountweasel is a thing that does not exist in any form, whether it fictional or real. Crazanian is only seen on Christmas lists as filler for other languages.
The conjunction in this sentence is "or."
"Heard" is a past tense action word that refers to perceiving sound through the ears. "Seen" is also a past tense action word that refers to observing something with the eyes.
An echo. It is a reflection of sound that can only be heard, and it repeats what is spoken to it.
children.
Water is possibly the only thing that can not be caught but can be seen and heard.
A person who cant find . or , from his keyboard.
echo
No, he has never been heard or seen talking in Half-Life. However, there have been references inside the game that imply that at some point he has spoken. But never in game.
No, the noun 'words' is a concrete noun, a word for something written (seen) or spoken (heard); a word for physical things.
Kids are both to be seen and heard
Music or sound is something that can be heard but not seen.
The noun lie is an abstract noun. Words can be physical, a concrete noun, either spoken (heard) or written (seen), but the truth or untruth of the words is a concept.
She is heard but never seen: Heard in (How to Spank A Star; season 3)
It's seen & NOT heard- It means they should not interfere in adult conversation.