大人们也兴高采烈地参与到谈话中。

The ___adults are also joyfully participating in the conversation.

公园里有很多家长带着孩子在玩耍。

There are many ___adults playing with their kids in the park.

这个游乐场对成人和儿童都开放。

This playground is open to both ___adults and children.

这种蝴蝶的成虫翅膀展开可达15厘米宽。

The ___adults of this butterfly can have a wingspan of up to 15 centimeters.