从侧面观察的时候，上唇和上颚非常发达，与下颚交叠，形成矩形外观。
The flews of the upper jaw are strongly developed and overlap the lower jaw to give a square look when viewed from the side.
本发明公开了一种海绵运输的包装方法，其是将单片的海绵垫体从两边分别向中间卷压成型，固定后会接近形成矩形体。
The invention relates to a sponge transportation packing method, pressing the single sponge cushion from both sides to the center, forming into rectangular shape after fixation.
这个不寻常的红色矩形星云是怎么形成的？
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