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distance between centre
 distance between centres
auto. 顶尖距
| lines of
 line of
auto. 压力线; 啮合线
| tracks
 track
gen. 跑道; 追踪; 足迹
IT 磁道; ; 声序; 电痕

to phrases
distance between centres
auto. 顶尖距
distance between centre: 11 phrases in 5 subjects
Bridge construction5
Communications1
Metallurgy1
Rail transport1
Technology3