Although positive people showed a greater resistance to colds, negative people did not necessarily get sick more often.
尽管积极的人对感冒表现出较强的抵抗力，消极的人也不一定更容易经常感冒。
2
Negative PCR works like wind resistance does on your car: the harder you put your foot down, the more the wind impedes any further increase in your speed (see "It pays to be negative").
负pcr的工作原理就像风对汽车的阻力一样：踩油门越困难，提速时风的阻力就越大。
3
However, this approach has led to the evolution of resistance to pesticides and has severely negative impact on human health and the environment.