double contraction

基本解釋

To economists, a double-dip has a narrow meaning: a period when the economy comes out of recession only to suffer another contraction.
對于經(jīng)濟學家來說，“二次探底”的定義是很嚴格的：二次探底是指經(jīng)濟從衰退到復蘇，再萎縮的時期。
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By anti-frozen performance, resistance to abrasion, contraction and resistance to fatigue and other durability tests to examining the mixture ratio of the double mineral composite powder concrete.
通過抗凍性、抗?jié)B性、耐磨性、收縮性以及抗疲勞性等耐久性試驗對研究中所確定的配合比進行檢驗，最終得出復合雙摻礦質(zhì)超細粉路面混凝土的最佳配合比。
The column uses the double expansion and contraction function hydraulic cylinder, increases the power stroke to satisfy the support to adjust the high scope the need.
立柱采用雙伸縮作用液壓缸，以增加工作行程來滿足支架調(diào)高范圍的需要。