سوال ۲۶ کنکور ارشد مهندسی برق ۱۴۰۰

PASSAGE 3 (excerpt, paragraph 1):

For millennia, people have harnessed the power of the wind to accomplish tasks. For example, merchants once relied on the wind to sail the world. Also, old windmills, once used to mill cereals, are an iconic part of Holland's landscape. With our lives centered around electricity, modern scientists have found innovative ways to convert the kinetic energy from the wind into electric power.

Question: The author mentions merchants relying on the wind to sail the world as an example of ..........