In January the penny post was established, covering the whole country: in its first year it would double the volume of letters written.
一月，遍布伦敦的邮局建成了，第一年的书信量就翻了一番。
The electrode concerned in this article is a medical one - a platinum wire electrode made by covering glycyrrhetinic acid with double - decked polymer film.
本文研制的电极是在铂丝上涂双层聚合膜而制成的一种甘草次酸涂丝药物电极。
The best is double plastic membrane cover, although more expensive than plastic covering layer higher, but the heat preservation effect is good.
最好是覆盖双层塑膜，虽然成本比单层塑膜覆盖高些，但保温效果较好。
In order to reduce energy consumption in greenhouse, the underground heat storage system with double-film covering was designed based on the plant physiology.
针对温室加温能耗大的突出问题，设计了双层覆盖温室地下蓄热系统。
In order to reduce energy consumption in greenhouse, the underground heat storage system with double-film covering was designed based on the plant physiology.
针对温室加温能耗大的突出问题，设计了双层覆盖温室地下蓄热系统。
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