医学专家们将在下周的全国会议上讨论最新的研究成果。

Medical experts will discuss the latest research findings at the national ___convention next week.

在正式场合，遵循社交礼仪是必要的。

In formal settings, it's important to follow social ___conventions.

许多国家签署了这项国际公约以保护濒危物种。

Many countries signed the international ___conventions to protect endangered species.