It is Xishuangbanna, the largest treasure house of tropical plants. What does the dash do?

Number of columns: This kind of tree has a long life span, usually 200 to 400 years.

For example, the Poles here are simply natural beverage factories.

Contrast: Oil palm is known as the "world oil king", but the oil content of oil melon in Xishuangbanna is much higher than that of oil palm.