That is when a seed is manipulated in a laboratory to do something not intended by nature -- like taking the DNA of a fish and putting it into the DNA of a tomato. Yuck.
这是指在实验室改造种子， 进行培植，而不是用自然的方式种植-- 就好比提取鱼类的DNA， 把它植入到西红柿的DNA中--恶心。