Material Certs:决胜材料.救援材料.
Cert:c.n (informal)
(1) 1.(often a dead--)Certainty.
2.esp in the opinion of the speaker and usu about s.t that
will happen,succeed etc.例句:He claimed that his horse
was a dead cert(an absolute certainty)to win the race.
(2) certificate
参考