4) SIP-193 and SIP-196
SIP-193 refactors the SystemSettings library to reduce the contract size.
SIP-196 removes all formerly used centralized oracle code from Synthetix contracts, as we now utilize @chainlink feeds.
4） SIP-193和SIP-196
SIP-193重构SystemSettings库以减少合同规模。
SIP-196从Synthetix合同中删除了所有以前使用的集中式oracle代码，因为我们现在使用@chainlink提要。