the序数词后通常加 形容词的最高级。例如：

1. The first tallest building in the city.

2. The second largest country in the world.

3. The third longest river in the world.

需要注意的是，当序数词为first时，有时可以省略the，因为first本身就有特指的含义。例如：The tallest building is the one on the left.