（adj.） undertaken, assured（n.） surety, plight, undertaking, guaranty, warranty, assurance, avouchment, pledge, sponsion, sponsorship（v.） guarantee, commit, engage, plight, undertake, wager, guaranty, warrant, assure, ensure, insure, pledge, safeguard, certify, certificate其中undertaking, guaranty, warranty, assurance 都很多人用
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