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.

立柱采用双伸缩作用液压缸，以增加工作行程来满足支架调高范围的需要。

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In the plane layout of double dikes, the sudden expansion or contraction should be avoided. The elevation of the top of the dike should be identical with middle tide level.

双导堤平面布置不宜呈突然扩大或收缩状，堤顶高程宜与中潮位一致。

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As Spain endures a double-dip contraction, there are concerns that the stern economic medicine might be more than an already weakened patient could tolerate.

WSJ: Spaniards Feel Sting of Big Budget Cuts