it means three way handshake.
Because that object does not reflect light. So glass is transparent because light passes through it. Skin is transparent under X-rays because the skin cannot reflect the high energy Xrays.
Yes you can. In fact they sell Synthetic blends.
with, together Synonyms of vindictive include vengeful, unforgiving and spiteful.
it means that you can see through it. if you take a clear glass plate and put it to your face, you can still see yourself.