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butterfly valve
This butterfly valve is used to control the flow of fluid.
a sphenoid bone
He explained in detail about the structure of the sphenoid bone.
T-square
He drew a straight line using a T-square.
(grammar) present progressive form / (by extension, with で) making progress
She is learning the grammar of the present progressive form.
a parallelogram
This shape is a parallelogram.
Alternative spelling of 平行四辺形 (“parallelogram”)
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