He had been taking part in an international symposium on population.

他那时在参加一个有关人口的国际研讨会。

《柯林斯英汉双解大词典》

An international symposium on the art of Fu Baoshi is held in Nanjing.

傅抱石艺术国际研讨会在南京召开。

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E. g. He had been taking part in an international symposium on population.

他那时正参加一个有关人口问题的国际研讨会。

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According to two studies presented to the International Symposium on Olfaction and Taste, held in San Francisco this week, that is exactly what happens.

ECONOMIST: Hormones influence how sensitive taste buds are to sugar

In October 2010, an international symposium on urban futures and human and urban well-being elaborated plans for a new three-year initiative to promote sustainable urban development and improve the relationship between cities and the ecosystems of which they are a part.

UNESCO: Urban connections of biosphere reserves

These include recommendations that ICSU support societies that are keepers and developers of traditional knowledge, that it foster training which equips young scientists and indigenous people to carry out research on traditional knowledge and that it organize an international symposium on science and traditional knowledge.

UNESCO: Local and Indigenous Knowledge Systems