布宜诺斯艾利斯以其美丽的建筑和热闹的夜生活闻名。

___Aires is famous for its beautiful architecture and lively nightlife.

城市里的空气常常被污染，而乡村的空气则清新得多。

The ___air in cities is often polluted, while that in the countryside is much fresher.

这个盾徽中盾牌的颜色是红色的。

The shield's ___hues is red in this coat of arms.