clearance of span
... span chisel ==> 展平凿,磨平凿 span clearance ==> 跨度净空 span dogs ==> 木材抓起机 ...
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这决定了净空高度和结构跨度，以及方案的运动矩阵。
This determined the clearance heights and structural spans, as well as the matrix of movements of the project.
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