In fact, they're not: it's really a very, very high-resolution input medium -- you have to just do it twice, you have to touch the screen and then rotate your finger slightly -- and you can move a cursor with great accuracy.
事实上, 他们错了. 这是一个非常非常高解析度的输入媒介. 你只需要做两次. 你需要接触屏幕, 然后轻轻的旋转你的手指. 之后你可以轻松准确的移动指针.