| 单词 | natural chemical |
| 释义 | natural chemical Researchers have isolated the natural chemical acetylcholine which sends signals round the nervous system. The Sun The academics estimate that the natural chemical cycle has collapsed to six per cent of its former size. Times, Sunday Times When the anticipated natural chemical release doesn't arrive, the smoker experiences stress and craves the endorphin release they now associate with smoking another cigarette. The Sun The distillation of products from wood characterized the transition from the use of natural chemical products (chemical industry) to that of fully synthetic products. Retrieved from Wikipedia CC BY-SA 3.0 The periphyton and natural chemical processes are responsible for approximately 90 percent of pollutant removal and waste breakdown. Retrieved from Wikipedia CC BY-SA 3.0 |
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