When an assumptive cutting plane object , the cross section drawn, which is called a cut.
假想用剖切平面将机件的某处切断,仅画出剖切面与机件接触部分的图形称为断面图, 简称断面.
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"an assumptive person"
"on a subject like this it would be too assuming for me to decide"
"the duchess would not put up with presumptuous servants"
"an assumed increase in population"
"the assumed reason for his absence"
"assumptive beliefs"
"his loyalty was taken for granted"