part 2 teaching resources 第二部分 教学资源 section 2 notes to difficult sentences from unit 2 sailing the oceans 1.so accomplished navigators were able to use it to plot their positions．熟练的领航员就能够用它来确定自己的位置。句中accomplished是形容词，意思是“优秀的，熟练的”，作定语修饰其后的名词。accomplished
