The slope is negative 3/19
You would use the word it's in place of the words "it is" because it is a contraction.
If you were to say "It is hot outside today!", you would instead say "It's hot outside today!"
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They have strong jaws, are fast and great at attacking herds of buffalo attacking the weak or smaller buffalo as the others try to escape.
Zai Jian.
There should be a 4th tone on the Zai and a 4th tone on the Jian.