As an oracle had foretold, he was killed accidentally by a blow from a quoit thrown by his grandson Perseus.

 [解說]

1.      “As an oracle had foretold”：「如同一個神諭所預告的」。“oracle”是「神諭」，Apollo 在 Delphi 地方會給神諭，去詢問 (consult) 的人都說很靈。“foretold”是「預告」，fortune-teller 就是會 foretell 人家的未來。

2.      “he was killed accidentally by a blow from a quoit”：「他意外地被圈環給擊斃了」。“accidentally”是「意外的」(= by accident 或 by chance)。“blow”是「打擊」。“quoit”是「鐵圈、繩圈或其他圓環」，“quoits”則是常見的「擲圈套樁」遊戲。“a blow from a quoit”是「來自圈環的打擊」。

3.      “a quoit thrown by his grandson Perseus”：「一個被他孫子 Perseus 丟擲的圈環」。 “a quoit thrown …”= “a quoit which was thrown …”。

4.      全句說出：神諭真準，Acrisius 果然被孫子 Perseus 丟擲的圈環給意外的擊斃。

 [複習填充]

As an oracle had f       , he was killed a          by a blow from a q     thrown by his grandson Perseus.