seize and keep someone as a hostage
把某人持为人质
an act, commitment, or remark which is regarded as unwise because it invites trouble or could prove difficult to live up to
招惹麻烦（或不明智、很难做到）的行为（或许诺、话语）担风险
making objectives explicit is to &B{give a hostage to fortune}.
使目的明确就要承担风险。