Also, a positive and a negativelead are also needed.
同时，积极和消极的铅也需要。
2
Disputes between parents, breakdown of a family and improper ways of education can lead to adolescents forming negative personalities and even committing an offence.
父母冲突、破碎家庭、教育方法不当以及家庭环境影响都会导致青少年形成不良个性，甚至走上犯罪的道路。
3
It is believed that scientists can learn more "negative" results and that this can finally lead to positive results.