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Discover LudwigThe phrase "sharp line" is grammatically correct and commonly used in written English
It refers to a clear and distinct division or boundary between two things. Example: The artist used a fine-tipped pen to draw a sharp line between the light and dark areas of the portrait.
Exact(57)
Thus, no sharp line divides normal and abnormal values.
A continuum runs between the two conditions; there is no sharp line.
Science leads us to draw a sharp line between what is real and what is unreal.
There is no sharp line of demarcation between the tropics and the subtropics.
There is no sharp line between these two ends of the spectrum.
Despite some memory loss, Betty could still command and entertain with a sharp line.
You can't draw a sharp line between peace, security, development and human rights.
But United States officials drew a sharp line at building new reactors for North Korea.
Similar(3)
The slightest touch blurs their sharp lines.
Those sharp lines, those flexed feet, those big squats!
Notice the sharp lines that divide some of the lagoons.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com