他告诉我们当他11岁左右时一位警官曾数次来到他所就读的学校来警告他们这种非法物质的危害。
When he was about 11, he says, a police officer made several visits to his school to give warning of the dangers posed by illicit substances.
双汇集团总裁办公室经理称，双汇集团施行十八道检验确保产品安全，但其并无解释非法物质被验的原因。
The group had 18 inspection procedures to ensure quality of its pork, said an executive with in the chairman office of the group, without explaining why the illegal additive failed to show up.
除了用法律限制非法物质、烟草和酒精的可获得性之外，减少对这些物质需求的干预措施也会改善健康发育状况。
In addition to laws that limit the availability of illicit substances, tobacco and alcohol, interventions to reduce demand for these substances improve the conditions for healthy development.
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