中心线 [数] Center line ; [数] centre line ; axis
连心线 line of centers ; [机] Line of centres
轴承轴心线 [机] bearing axis
副都心线 Tokyo Metro Fukutoshin Line ; Fukutoshin Line
轴心线 axial lead ; shaft axis ; axial lead,axial lead ; axial l lead
实心线 solid wire ; solid line
楦底中心线 last bottom centerline ; last bottom featherline
后跟座中心线 heel centerline
外圈轴心线 [机] outer ring axis ; outer ring housing wash axis
嵌环恐中心线 thimble hole centerline
在地面适当位置安装下固定转轴座，保持上、下固定转轴座在同一中心线。
H. Install a fixed shaft properly on the ground. Maintain both the top and bottom fixed shafts seat in the centerline.
当至少安装两盏石英灯时，所述至少两盏石英灯以杯体的上下中 心线为对称轴对称安装；
When installing at least two quartz lamps, the at least two quartz lamps are equipped symmetrically to the vertical central line of the cup body and connected in series or parallel.
探索地平线之外到底有什么的好奇心把早期的波利尼西亚人第一次带到夏威夷海岸，同样的好奇心又驱使当今的天文学家们去探索太空。
The same curiosity to find what lies beyond the horizon that first brought early Polynesians to Hawaii's shores inspires astronomers today to explore the heavens.
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