1·By clicking and dragging with the left mouse button, the handles of the grid widget can be translated, rotated and scaled, in order to test how well straight lines in the image have been undistorted.
通过点击和拖动使用鼠标左键，处理网格的小部件可以移动、旋转和缩放，为了测试直线在图像一直不失真。
2·As the amplifier tuned load circuit, they are able to select the base component cosine pulse to obtain undistorted amplification signal output, so this amp is also known as tuned power amplifier.
由于放大器的负载为调谐回路，所以能选出余弦脉冲中的基准分量，获得不失真的放大信号输出，因此这种放大器也称为调谐功率放大器。