And its basic segments are four acmes and four chains of life. 双螺旋结构的基本要素由四个极点与四段生命链构成。
Devices made of thermoelectric material have many special advantages, and have been successfully used in a few acmes of science and technology. 由热电材料制成的热电器件具有很多独特的优点,在少数科技尖端领域已获得成功的应用。