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。

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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。

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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。

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This section was shaped by forces even more ancient than the Romans.

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Since small deviations are common and large ones are rare, the result of plotting data in this way is a curve shaped somewhat like the cross-section of a bell.

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It has a shorter, lower, thinner and more sculpted nose section, with a dramatically shaped front wing.

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