Morphology: Comet-shaped mass with "tail" in collapsed SLS and "head" in posterior SMS.
形态：彗星状肿块，尾部位于塌陷的舌下间隙，头部位于下颌下间隙的后方。
Arrow: Printing fault in gravure which appears as a mark in the shape of an arrow head on the print. Also called comet.
箭形印记：是照相凹版印刷的瑕疵。印刷品上带有像箭头的印纹。亦称慧星印记。
I look up the sky; one comet passed over my head, then disappeared, and left no trace.
我仰望天空，一颗流星从我的头顶划过，没有痕迹。
The head of the comet remains quite bright and easily visible to even city observers without any optical aide.
彗星的彗核仍然非常明亮，因此不需借助任何设备，用肉眼就可以看到。
The head of the comet remains quite bright and easily visible to even city observers without any optical aide.
彗星的彗核仍然非常明亮，因此不需借助任何设备，用肉眼就可以看到。
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