以下为句子列表：
英文: Acetyl CoA plays a key role in metabolism, being a precursor of the KREBS CYCLE and GLYOXYLATE CYCLE, and the starting point for synthesis of fatty acids, terpenes, and some amino acids.
中文: 它在新陈代谢的过程中扮演非常重要的角色，是三羧酸循环和乙醛酸循环的前体物质，而且还是合成脂肪酸，萜类以及一些氨基酸的起始。
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英文: For the smoothoperation of this cycle, degradation is just as important as synthesis: the green plants produce great quantities of polymers, suchas cellulose, and innumerable other compounds like alkaloids, terpenes, and flavonoids, that green plants cann
中文: 为了使这个循环顺利运行，分解跟合成同样重要∶绿色植物制造大量聚合物，像纤维素以及无数别的化合物，像生物硷、松烯、晶状丙酮，这些都是绿色植物行呼吸时不能利用作能源的东西。
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英文: Some aromatic agents, diffused smell and terpenes from trees as well as their application in medicine were introduced.
中文: 摘要介绍了部分芳香剂及其散发出的香型，以及部分能散发出萜烯类物质的树木和它们的药用功能。
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英文: The avian activity also changes the chemical flavorof the trees by boosting terpenes—chemicals found to repel tree-eating pests such as bark beetles as well as porcupines and squirrels.
中文: 鸟类活动还会刺激树木产生松烯，改变树木的化学「味道」──这种化学物质已知可以驱除啃食树木的害虫，如树皮小蠹，以及豪猪、松鼠等。
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