Teflon isn't especially "tough"; it's actually fairly weak mechanically because it doesn't stick to anything very well, not even itself. It is very chemically resistant, but that's because the carbon-fluorine bonds are very strong and has nothing to do with the length of the carbon chain.
To provide an tough structure.
The GSD is a hardy breed because they ere bred like that. They were herders and so needed to be of a tough structure.
exoskeleton
Are they tough because you can put like 1000gk on the plastic bag and that is why it is tough.
A bacterial cell is a tiny structure that contains bacterial DNA encased by a tough outer covering called the cell wall. The cell wall provides structure and protection to the bacterial DNA inside.
A band of tough tissue that connects various bones or cartilage
the dura
It's tough seed coat.
Here are three sentences using the words 'tough' and 'enough': "He did not want to let Luke play in the game with all the older boys because he was not sure that Luke was tough enough" "The lion lost the fight because he was not tough enough to fight the bigger, stronger lion" "Sam did not complete the race because he was not tough enough"
When words are used at the start and again at the end, but generally reversed, and with different inferable meanings. "When the going gets tough the tough get going" "iCloud isn't like a Network-Attached Storage box because it's online, not accessable offline, like a box of storage attached to the network is."
Because he works out.
it is tough because there pink under layer contrats between sepantont