短语词组短语barrel l distortion 桶形失真;桶形畸变barrel and pincushion distortion 状和枕状变型horizontal barrel distortion 水平桶形失真barrel & pincushion distortion 何谓桶状和枕状形变vertical barrel distortion 垂直桶形畸变;垂直桶形失真 返回 barrel distortion