Some changes in DNA occur naturally and lead to no harmful effects;
有些DNA的变化是自然发生的不会产生有害影响；
Experiments have shown there to be no harmful effects from chronic exposure to acetylene at high concentrations.
实验显示慢性接触高浓度乙炔没有有害影响。
Some changes in DNA occur naturally and lead to no harmful effects; these changes in a population are called polymorphisms.
有些DNA的变化是自然发生的不会产生有害影响；这些在一个群体中的变化被称为多态性。
Professor Walker says straw takes in carbon dioxide as it grows. So it can be seen as having no harmful effects on the environment.
沃克教授说，稻草能在生长过程中自行吸收二氧化碳，因此对于环境无任何负作用。
Acetylene is a simple asphyxiant and anesthetic. Experiments have shown there to be no harmful effects from chronic exposure to acetylene at high concentrations.
乙炔是简单的窒息物和麻醉剂。实验显示慢性接触高浓度乙炔没有有害影响。
Conclusion: LGOCAA could promote the restoration of the wound's surface of the animals with experimental traumas, and had no harmful effects on bacterial infection.
结论：复方氨基酸脂质凝胶能促进实验性创伤动物创面修复，对细菌感染无不良影响。
Tests showed that acetic acid wastewater, when mixed with acrylic fiber wastewater in any proportion, exerted no harmful effects on the operation for the acrylic fiber wastewater treatment plant.
试验表明将腈纶废水与醋酸废水按任意配比混合，都不会对腈纶污水处理场的运行产生任何不利的影响。
Appearances can deceive, ecologists caution, and many of these exotics may be considered acceptable only because no one has documented their harmful effects.
生态学家警告说，外表可能具有欺骗性，而且这些外来物种中可能有许多是为人接受的，只是因为没有人记载过其有害影响。
Yet appearances can deceive, ecologists caution, and many of these exotics may be considered acceptable only because no one has documented their harmful effects.
然而，生态学家警告说，这些表象可能并不是真的；而且，这些外来物种中有许多可能被认为是可接受的，只是因为没有人记载过它们的有害影响。
It has beneficial effects on renal function immediately after OLT as well as later, and no additional harmful effects.
它在OLT后即刻对肾功能产生有益的影响，随后也一样，而且没有额外的有害影响。
We should spare no efforts to protect local environment and history from the harmful effects of international tourism.
我们应当努力保护当地环境和历史，使之不受国际旅游业的不利影响。
Furthermore, there are no directly harmful effects on the computer.
此外，也不会对电脑造成直接性的不良影响。
With continuing publicity about the need for healthful diets, and with new research about the harmful effects of eating too much sugar, nationwide demand for sugar will no doubt decline.
随着持续不断的有关健康饮食必要性的宣传，以及对食用过多糖份所带来的有害后果所作的新研究，全国范围内对糖的需求量将会下降。
There are no harmful side effects to you or your baby.
无论对胎儿还是母体，超声波都没有任何副作用。
There are no harmful side effects to you or your baby.
无论对胎儿还是母体，超声波都没有任何副作用。
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