The morning songs were the first throwing forth of my inner self outwards, and consequently they lack any signs of such concentration.
《晨歌集》是我心中的自我第一次迸发出来，因此缺乏这种浓缩的任何表征。
2
Visit any Chinese bookstore, and you will see a large concentration of consumers in the sections offering ESL self-study books, programs, and gadgets.
如果你去中国的任意一家书店，都会看到在英语自学教材、教学项目和教学工具的柜台前聚集着大批消费者。
3
Personnel, including rescue workers, should not enter areas where the oxygen concentration is below19.5%, unless provided with a self-contained breathing apparatus (SCBA) or airline respirator.