A part that operates by sliding, as the U-shaped section of tube on a trombone that is moved to produce various tones.
型滑管：靠滑动操作的部分，如长号上u型的管子部分，拉动它可以产生各种声调。
The bar steels adopt I steels, Angle steels or channel steels, or adopt steel plates which are welded into a cross shaped section.
型钢选用工字钢、角钢或槽钢，或者采用钢板焊接为“十”字型截面。
The cross section of arch rib except the part closed to the arch springer is new dumbbell-shaped section which is different from the traditional one.
该桥拱肋截面除拱脚段外采用与传统哑铃形截面不同的新型哑铃形截面。
The approximate Solution and curve fittings of critical depth of round and U-shaped section canal by applying an equivalent square coefficient method were presented in this paper.
本文应用等面积系数法提出了圆形和U形断面临界水深的一种直接计算公式。
The horseshoe-shaped section supports your head and can be adjusted to the correct thickness.
马蹄型部分可支撑你的头部，调整到正确的厚度。
The horseshoe-shaped section supports your head and can be adjusted to the correct thickness.
马蹄型部分可支撑你的头部，调整到正确的厚度。
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