2.signal vi.& vt.发信号n.信号 教材原句 ①For example, I have learned to signal 　to     my teammates in computer language to give me the ball when I am open and have a good shot for a goal.例如,当我前面没有防守,有机会射一个好球的时候,我已经学会了用计算机语言向队友示意把球传给我。