chemical action

常见例句

• Coal was formed out of dead forests by chemical processes.
  煤是已死森林经过化学作用而形成的。
• As the wrigglers develop, the gelatinous outer membrane decomposes, perhaps triggered by a chemical change in the tadpoles.
  随着这些小虫的生长，胶状的外部膜会分解，这可能是由于蝌蚪内部的化学作用而触发的。
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