Safeguards to prevent drug poisoning include testing in animals then human volunteers and then patients.
预防药物中毒的安全措施包括先在动物身上做试验，再试用于志愿者，最后才用于病人。
Safeguards to prevent drug poisoning include testing in animals, then human volunteers, and then patients.
预防药物中毒的安全措施包括先在动物身上做试验，再试用于志愿者，最后才用于病人。
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