The voice came from an oblong metal plaque like a dulled mirror which formed part of the surface of the right-hand wall. Oblong的同義字a rectangle is a two-dimensional shape with four 90°/right angle corners. An oblong shape is simply a shape that is longer in one dimension.
The oblong box (长方形盒子) the oval portrait (life in death) (椭圆形肖像(生死相依)) peter pendulum, the business man (彼得·钟摆,商人) the pit and the pendulum (陷阱与钟摆).