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In the customary international law system, there exist general customary international law and regional customary international law. Based on the general practice and opinio juris of the States surrounding the South China Sea, China’s historic rights which conclude historic title to all the maritime features in the South China Sea, and historic fishing rights and navigational rights, are regulated by regional customary international law. Due to the parallel relationship between this regional customary international law and the United Nations Convention on the Law of the Sea (UNCLOS), China’s historic rights should co-exist with the rights regulated by UNCLOS.

Removing the blocked molecular groups and fully exposing the intrinsic active sites of metal-organic frameworks (MOFs) could give full play to their advantages of multi-active sites and multi-channel mass transfer, which will benefit the electrocatalytic oxygen reduction reaction (ORR) in fuel cells. Here, the partial diligandation-activated ZIF-67 (named as ZIF-67–400) with excellent ORR performance was obtained by simple low-temperature pyrolysis. The ORR electrocatalytic activity exhibits a half-wave potential of 0.82 V and the stability of maintaining 96% activity after 10 h of operation, which is comparable to commercial Pt/C. Further research studies reveal that the morphology, special dodecahedron configuration, and crystal structure of ZIF-67-400 are maintained well during the pyrolysis, but some hydrocarbon groups in the ligands are eliminated, resulting in the active sites being exposed and coordinated with the intrinsic porosity, improving the catalytic performance. This work may provide an alternative path for activating the electrocatalytic performance of metal-organic frameworks by low-temperature annealing.