求翻译：长期需要购买剧毒化学品的，必须向所在地的地级以上市公安机关申领《剧毒化学品购买凭证》后，方可购买剧毒化学品。是什么意思？

Long-term need to purchase highly toxic chemicals to the seat of the prefecture-level to apply to listed public security organs "proof of purchase of highly toxic chemicals," only after the purchase of highly toxic chemicals.

You will need to purchase long-term toxic chemicals, and it is located at the level of public security organs listed to apply for the toxic chemicals of proof of purchase, and you can purchase toxic chemicals.

Needs to purchase the violently poisonous chemical for a long time, must go on the market the public security organ after the locus place level to apply for "Violently poisonous Chemical Purchase Certificate", only then purchases the violently poisonous chemical.

The long-term needs of the purchase of highly toxic chemicals must apply to the seat of the prefecture-level city public security organs above the highly toxic chemicals after the proof of purchase, highly toxic chemicals may be purchased.

正在翻译，请等待...