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上下运动 shàngxià yùndòng
hydroel.st.	up-and-down movement
tech.	lift movement; see-saw motion; up-and-down motion; vertical motion
textile	lower and lift motion
车身上下垂直运移动
auto.	up-and-down motion; up-and-down movement
一上一下运动
gen.	seesaw
上下〔升降〕运动
tech.	up-and-down movement
上下〔前后，往复〕 运动
construct.	seesaw
上下〔往复〕 运动
construct.	seesa motion
上下往复运动
textile	see-saw motion

上下运动: 8 phrases in 5 subjects

Drilling	1
General	4
Metallurgy	1
Technology	1
Textile industry	1