https://online2.tingclass.net/lesson/shi0529/0009/9907/282.mp3
https://image.tingclass.net/statics/js/2012
講解文本：
turn one's back 不愿幫助，拋棄，拒絕，不理睬
Jack turned his back on me when I asked him for help.
當我請求Jack幫助時，他完全不理會。
I can't turn my back on my uncle Steve, he's old and sick now.
我叔叔Steve又老又病，我不能丟下他不管。
瘋狂練習(xí)吧!
