He was son of Zeus and the Arcadian nymph Callisto.  Zeus' wife, Hera, changed Callisto into a bear to show her animosity towards Zeus' object of love.  Out hunting, Arcas would have killed his mother, the bear, if Zeus had not intervened and changed them into the constellations of the Great and Little Bear. 

[解說]

1.      “He was son of Zeus and the Arcadian nymph Callisto”：他是天王 Zeus 與 Arcadia 地方的女神 Callisto 所生的兒子。 “nymth”：山林、河海、泉水一帶之女神。

2.      “Zeus' wife, Hera, changed Callisto into a bear”： Zeus的妻子 Hera 把 Callisto 變成一隻熊。

3.      “to show her animosity towards Zeus' object of love”：為了表示她對 Zeus 的愛情目標所產生的怨恨。 “animosity”：憎惡、怨恨。 “object to love”：愛情目標。

4.      “Out hunting” =  When he was out hunting：(當他) 外出打獵時。

5.      “Arcas would have killed his mother, the bear”： Arcas 將已殺死她母親，也就是那隻熊。 “would have killed”： 「將已殺死、但沒殺死」 (此為假設法)。

6.      “if Zeus had not intervened and changed them into the constellations of the Great and Little Bear”：如果 Zeus 沒有介入而把他們變成大小熊星座。 “if ...  had not intervened”： 「如果沒有介入，其實有介入」 (此為假設用法)。 “intervene, intervention”：介入、干涉。 “constellation”：星座。 “The Great and Little Bear”：大小熊 (星座)。 

[複習填充]

Arcas was son of Zeus and the Arcadian n       Callisto.  Zeus' wife, Hera, changed Callisto into a b       to show her a         towards Zeus' o         of love.  Out h      , Arcas would have killed his mother, the bear, if Zeus had not in         and changed them into the c             of the Great and          Bear.