一种线性的底部下凹的洼地，水和沉积物可以从中流过，沉积物可沉积在其中呈有特点的、往往是纵长的沉积体。

A linear, commonly concave-based depression through which water and sediment flow and into which sediment can be deposited in distinctive, often elongated bodies.

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操练和闩上纵梁附件板材对长的成员。

Drill and bolt the stringer attachment plate to the long member.

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通过速度折减量与坡长之间的关系曲线，提出基于运行速度差和满足公路服务水平要求的各级公路最大纵坡坡度与坡长限制值。

By analyzing the relationship between speed loss, speed discount in different gradient and grade length, the paper also brings forward the maximum longitudinal gradient and grade length limit.

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