汇率走低能够使一个国家的产品获得相对于竞争对手产品的价格优势，从而提振该国的出口。
A lower currency can boost a country's exports by making them relatively inexpensive compared with competitors'.
为了使内置式减振镗杆有比较好的减振效果，在设计时应该对其设计参数进行优化。
In order to have a better damping effect, the design parameters of the built-in damping boring bar should be optimized in the design stage.
每一振点的振捣延续时间应使混凝土表面呈现浮浆和不再沉落为止，约20 ~ 30s。
For every vibrating point, the vibration shall go on till free mortar appears on the concrete surface and not sinks any more, normally 20 ~ 30s.
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