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.
单弦杆平板网架由于无下弦杆，因而具有平面外抗弯刚度较低的特点。
The single-chorded plane space truss have the low flexural rigidity out of plane because of lacking bottom chord.
空腹屋架下弦处于预压力、强大的轴拉力、弯矩和剪力共同作用下工作。
The lower chord of a vierendeel truss, when loaded, is subjected to the combined action of prestressed compression, large axial tension, moment and shear.
针对贵阳奥体中心主体育场罩篷空间钢管桁架屋盖中的上、下弦相贯节点，进行了足尺节点破坏试验。
The full-scale joints were made to conduct collapse test for the top and bottom chords of the tubular space truss of the roof, which is based on the main stadium of Guiyang Olympic Sports Center.
张弦梁结构是通过撑杆连接上弦抗弯受压刚性构件和下弦高强度拉索而形成的一类新型大跨度结构体系。
The Beam String Structures(BSS), using bar connecting arches and cables, is a new type of long-span structures.
本文研究对象为双箱梁下弦钢拉杆，主要阐述钢拉杆的锻造、非线性分析、计算机模拟、安装及监测技术等。
This article mainly states the rod in double box-beam rod structure, involving forging, nonlinear analyze, computer simulating, installing and monitoring technology and so on.
分两组由拱板下弦跨中同时向拱板支座浇筑混凝土，然后从拱板支座连续沿拱板上弦向中间合龙，使浇筑荷载相对均衡。
Concrete was poured in separately from mid-span of arch slab to the supports and then from the supports to the top chord of the arch chord so as to balance the pouring load.
分两组由拱板下弦跨中同时向拱板支座浇筑混凝土，然后从拱板支座连续沿拱板上弦向中间合龙，使浇筑荷载相对均衡。
Concrete was poured in separately from mid-span of arch slab to the supports and then from the supports to the top chord of the arch chord so as to balance the pouring load.
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