Iran and six world powers reached a landmark nuclear agreement in 2015, and as a result the country has witnessed far-reaching changes.陈天华诧(chà )异地望了一眼陈天豪，而后无奈(nài )的解释道(dào )：(🚟)当(dāng )然有，我还以为你明白了我之前说的话(huà )，原来你(nǐ )还是不(⏪)明白。