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1.The methods of spectrum analysis vary according to the wavelength region were studied.(1)____
译文：分析光谱的办法是根据所研究的波长范围不同而变化的。
2. Having resided in New Mexico for many years,painter Georgia O'Keefe employs such as Southwestern motifs as bleached bones, rolling hills and desert blooms.(2)____
译文：已经在新墨西哥州居住了很多年的画家乔治亚·奥基夫采用像泛白的枯骨、起伏的山丘以及荒漠这种西南风格的主题元素。
3. A microphone enables a soft tone to be amplified, thus making it possible the gentle renditions of romantic love songs a large hall.(3)____
译文：麦克风能把柔和的声音放大，这样使得温柔浪漫的情歌也能在大礼堂里演奏。
4. The Appalachian Trail, extending approximately 2,020 miles from Maine to Georgia, is the longer continuous marked footpath in the world.(4)____
译文：阿巴拉契亚小路从缅因州延伸到乔治亚州，大约2020英里，是世界上最长的、不间断作有记号的小路。
