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汉语拼音：xià xián

月相的一种，农历每月二十二日或二十三日，太阳跟地球的连线和地球跟月亮的连线成直角时，在地球上看到月亮呈⫏形，这种月相叫下弦，这时的月亮叫下弦月。

1. 农历每月二十二日或二十三日，太阳跟地球的联线和地球跟月亮的联线成直角时，在地球上看到月亮呈反“D”字形，这种月相称下弦。

   南朝 宋 鲍照 《登大雷岸与妹书》：“下弦内外，望达所届。” 唐 陆龟蒙 《别墅怀归》诗：“题诗朝忆復暮忆，见月上弦还下弦。” 郁达夫 《薄奠》中：“醒来的时候，已经是下弦月上升的时刻了。”

• Suspended equipments on the lower chord level of the roof truss exceed those of any other hangars in China both in numbers and in weights.

  屋盖下弦布置悬挂设备的数量和吊重均为国内机库之首位。

• The twilight was softly fading, the air filled with the fragrances of the Quarter and the sweetness of spring.

  暮色渐渐隐退，空气中充斥着下弦月夜的芬芳与春天的甘甜。

• crescent, The figure of the moon as it appears in its first or last quarter, with concave and convex edges terminating in points.

  蛾眉月月亮在上弦时或下弦时的形状，其凹边和凹边均汇合成点

• After the full moon and between the last quarter moon, the moon will be in its waning gibbous phase.

  满月以后与满月与下弦月之间，月亮将处在其渐亏的阶段。

• As the night was fast falling, the moon, being past the full, would not rise early.

  天黑得很快，偏巧这天又是下弦月，月亮不会很快升起。

• Neap tides: Tides of small range occur when the moon is at its first or last quarter.

  小潮：出现在每个月上弦或下弦时期，潮差特别小的潮汐。

• Besides, prestressed beams are adopted in below string bars, which can make section area smaller and make building space saved.

  且下弦杆采用预应力梁，使整个结构体系的杆件截面更小、更节省建筑空间。

• Experimental Study in the Long Span Bottom Pipe Pre-stressed Truss Structure

  大跨度下弦管内预应力空间管桁架结构的试验分析

• The Construction Analysis of Prestressed Bottom Chord Shuttle Shape Spatial Truss

  下弦管内预应力梭形空间桁架结构施工分析