three-span 三跨
three span greenhouse 三架径温室
three-span continuous beam 三跨连续梁
three-span continuous slab 三跨连续板
three-span guardrail system 三跨护栏系统
For two Three-Columniation End moment Equations at neighbor points, moved out sidesway, it is Three-span moment Equation of frame that be relationship moments in three spans with load.
利用在连续两个结点上的三柱端弯矩方程，消去侧移分量产生刚架连续三跨的柱端弯矩与荷载关系的三跨弯矩方程。
Flip your mattress and rotate it every three months to extend its life span.
把床垫翻过来并每三个月调换一次方向以延长使用周期。
The University of St Andrews 600th Anniversary will span three calendar years from 2011 to 2013.
圣安德鲁斯大学600周年的庆典将为期三年时间，从2011年到2013年。
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