v provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes
v guarantee payment on; of checks
v authorize officially
v guarantee as meeting a certain standard
v declare legally insane
v. （尤指书面）证明( certify的现在分词 ); 发证书给…; 证明（某人）患有精神病; 颁发（或授予）专业合格证书