A vertical farm is a glasswalled structure that could be built as tall as a skyscraper(摩天大楼). Since the garden is built upwards, rather than outwards, it requires much less space than an ordinary farm. The world is quickly running out of room for ordinary farmin...
A tree that is 10 feet tall casts a shadow on the ground that is 4 feet long. If the shadow of an electric post is 10 feet long, what is the height of the electric post? SOLUTION Step 1: Translating the sentence “10 feet tall casts a shadow on the ground that is 4 feet long”...