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，“下弦月”。
n. last quarter
misc. third quarter
... lower chord 下弦 ; 下弦杆 lower chord bracing 下弦支撑 lower chord panel points 桁架的下弦杆节点 ...
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... 下水管漏泄试验器 asphyxiator 下弦 bottom chord 下弦节点 lower-chord panel point ...
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田鼠巴贝虫 babesia microti 下弦 third quarter or waning moon 弦 bow string, string of musical instrument, watchspring, chord (segment of curve), hypotenuse, chord ..
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每年十一月或十二月的下弦月是最佳的观蟹时机，澳大利亚官方建议游客们选择这个时间前来圣诞岛观光。
For the best crab viewing, Australian officials advise tourists (pictured, a Christmas Island visitor in an undated photo) to arrive during the last quarter of the moon in either November or December.
月亮现处于下弦。
网架支承方式，采用“上、下弦铰支”可显著提高厂房的整体刚度。
The global stiffness of the powerhouse can be improved remarkably by thesupporting with hinged upper and lower chords.
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