please paraphrase this paragraph:

As an exception clause, Article XX of the GATT is designed for member States to derogate from certain treaty obligations under the GATT, so that the States can adopt national trade-restrictive measures in the pursuit of specified sustainable development. WTO panels and the AB have dealt with a significant number of cases under the exception clause, such as USShrimp,39 USGasoline,40 ECAsbestos,41USGambling,42 BrazilTyres,43and China-Rare Earths.44 These cases are of consequence not only because they establish the scope of member States' discretion in implementing the exception clause under the GATT, but they also develop a proper approach to balancing the discretionary power of member States and the interpretive power of international adjudicators in interpreting an exception clause in general.