它可能是独立发展起来的，但许多学者认为，农业和铁器在整个非洲的传播将非洲与近东区域和地中海区域的主要城市中心联系了起来。
It may have developed independently, but many scholars believe that the spread of agriculture and iron throughout Africa linked it to the major centers of the Near East and Mediterranean world.
教育者的主要目标之一应该是帮助学生培养独立思考的愿望和能力。
One of the primary goals of an educator should be to help students develop the desire and ability to think on their own.
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