All the mass measurements that have been done to date of these neutron stars where you see the pulsations... all of them are very close to 1.4 solar mass.
Astronomers have long suspected globular clusters contained intermediate-mass black holes, but there has been no conclusive evidence of their existence there to date.
天文学家长期怀疑球状星团中包含中等质量的黑洞，但至今一直没它们存在的确凿证据。
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To date, China has signed up to almost all the international legal instruments related to the non-proliferation of weapons of mass destruction.