nán / dé / yù / shàng / zhè / yàng / yí / gè / hǎo / tiān / wǒ / men / qù / jiāo / wài / zǒu / zou / ba

难得遇上这样一个好天，我们去郊外走走吧。

It's rare to have such lovely weather, so let's take a walk in the countryside.