Most important is that it is produced by the body; moderate doses of it are not harmful to normal body cells . 最主要之点是，因为它是机体本身产生的物质，所以适当的剂量对于机体的正常细胞无害。
New ways have been found for controlling harmful insects, for preserving food, for packaging, storing and marketing farm products . 控制害虫、保藏食物以及包装、贮藏和推销农产品的新方法发明了。
What a deal of grief, care, and other harmful excitement, does a healthy dullness and cheerful insensibility avoid ! 身体健康而头脑迟钝，心情愉快而感觉麻木，这可以避免多少忧虑、烦恼和无谓的痛苦呀！
The purpose of the early human testing was not to study positive results form peptide 7, but to look for any harmful side effects . 早期人体试验的目的，不是研究缩氨酸7号的积极效果，而是探索有无有害的副作用。
The motive behind it is, indeed, very often purely economic rather than vindictive, but this does not ameliorate its harmful impact . 采取这种办法主要是经济上的原因，而不是报复，但是这并没有改变它的损害程度。
This effect may be beneficial or harmful , or both 这种影响有好有坏或兼而有之。
It is not allow to a harmful examination in school 学校是不允许考试做弊行为的
She saw little that was harmful to her health 她很少看到对她健康有害的这一面。
Study on harmful effects of poly - drug abuse （三）滥用多种药物的祸害研究计划；
The man formed a habit of taking harmful drugs 这人养成了服用有害麻醉品的习惯。
