linear shadow造句

Pleural thickening may cause blunting of the costophrenic angle, but is distinguished from pleural fluid by the fact that it occurs as a linear shadow ascending vertically and clinging to the ribs.
:: : If you could tell the direction of a linear shadow ( like the shadow of a post or pole ), you would be able to tell the time of day fairly accurately as it would act as the gnomon of a sundial.
It's difficult to find linear shadow in a sentence. 用linear shadow造句挺难的