1. Two witnesses must certify that this is your signature. ����������֤��֤���������ǩ�֡�
2. Vendor to certify material and heat treatment with each lot. ��Ӧ����Ϊÿ�����ϳ��߲��Ϻ��ȴ���֤����
3. I certify that the above information is true and I agree him/her to participate the scheme. ��֤���������������������ȷ����ͬ����������������ƻ���
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v.
1. provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes
2. guarantee payment on; of checks
3. authorize officially
4. guarantee as meeting a certain standard
5. declare legally insane