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The simulation sound extractable NIZK

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I was recently reading the paper Hawk: The Blockchain Model of Cryptography and Privacy-Preserving Smart Contracts. To prove the security, the authors assume that the NIZK used in the protocol is simulation sound extractable.

What I have already know is that:

  1. If a NIZK is simulation sound, then it must process soundness
  2. In a high level, simulation sound extractable means that the prover could not only prove the membership of a language, but also proceess such a language. (Not for sure if this one is correct)

My question is:

  1. What does the simulation sound extractable mean?
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