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.
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.