【计】 zero proof
zero; nought; fractional; nil; nothing; wither and fall
【计】 Z; zero
【医】 zero
prove; certify; argue; demonstrate; justify; manifest; testify; vouch
【计】 proofness; proving
【化】 proofing
【医】 certificate; certify; proof
【经】 attest; attestation; authenticated; authentication; certification
certify; testimony