They regard keeping pets as a useless but harmful thing to do.
他把养宠物当做是无用而且有害的事。
A longer laser resonator length is benefit for laser linewidth, but harmful for single-frequency operation.
增加激光谐振腔腔长是获得窄带宽的有效方法，但是使实现单频工作困难。
They are only visible when they are bathed in ultra-violet light and subjecting them to such constant bombardment would be not only impractical but harmful.
只有当这些壁画沐浴在紫外灯光下时，这些细节之处才得以可见，但将这些传世珍品一直置于紫外灯的狂轰乱炸之下不仅不现实，对壁画本身也有害。
Chemical. Poisoning or injury caused by chemical substances, including ex-military chemical warfare agents or legitimate but harmful household or industrial chemicals.
由于化学物质造成的中毒或伤害，这些化学物质包括以前的军用化学战剂或合法但有害的家用或工业化学品。
The question of the intellectuals is above all one of ideology , and it is not helpful but harmful to resort to crude and heavy-handed measures for solving ideological questions.
知识分子的问题首先是思想问题，对于思想问题采取粗暴的办法、压制的办法，那是有害无益的。
But when stress is encountered continually, the body's reactions are more likely to be harmful than helpful to us.
但当压力不断出现时，身体的反应更有可能是对我们有害而不是有益的。
But Schweitzer contends the "mounting causal evidence" linking goal-setting and harmful behavior should be studied to help spotlight issues that merit caution and further investigation.
但施韦策认为，目标设定和有害行为之间的“因果证据越来越多”，应该加以研究，以帮助人们关注到需要谨慎和继续调查的问题。
I see a dangerous trap here: what if you experience something that feels very good in the short term but is actually harmful in the long term?
在这里我看到了一个危险的陷阱：如果你经历某事在短期内感觉很好，但从长期来看实际上是有害的，那该怎么办？
The villagers were forced to use oil lamps, which are not only expensive but also dangerous because of the harmful gases they produce.
村民们被迫使用油灯，油灯不仅昂贵，而且它们所产生的有害气体十分危险。
Smoking is not only harmful to smokers themselves but also a threat to public health, especially to women and children.
吸烟不仅对吸烟者本身有害，而且对公共健康，尤其对妇女和儿童的健康造成威胁。
Smoking is not only harmful to smokers themselves, but also threatens other people's health.
吸烟不仅对吸烟者有害，也会威胁其他人的健康。
Good revision should give you confidence, but if you are still worried, it's not harmful to follow some special customs.
好的复习能给你信心，但如果你还担心，不妨遵循一些特定的习俗。
But the decline of newspapers will not be as harmful to society as some fear.
但是，报纸的衰裙并不会像一些人所担心的那样对社会造成极大危害。
However, I see a dangerous trap here: what if you experience something that feels very good in the short term but is actually harmful in the long term?
然而，我发现了有个很危险的陷阱：如果你经历了一些让你在短期内感觉很好的事情，但它实际上从长远来看是有害的吗？
But coal plants have an additional strike against them: they emit harmful greenhouse gases.
但是煤电厂面临额外的压力：它们排放有害温室气体。
Lots of makeup claims to have sunscreens that block harmful rays, but it's probably not enough to ward off skin damage.
很多化妆品都声称有防晒成分阻挡有害射线，但实际上它们远远不够用来防止皮肤损伤。
If you know of something that people say is good but you know is harmful in the long term, run away from it.
如果你明白别人说的话是好的，但是长远来看却是有害的，那么就远离它。
But she added that if harmful, or pathogenic, super-small bugs existed they would be hard to detect.
不过，她补充道，如果超小细菌存在着危害，或者致病性，也很难检测出来。
But scientists say exposing harmful microorganisms to all these drugs is actually accelerating their ability to build resistance to many of the drugs we use.
但科学家认为，受我们平时使用的大多数药物影响，这些有害微生物更容易产生耐药性。
It's important that all drugs are closely monitored for side effects, but equally, not every harmful event that happens after having a vaccine will have been caused by the vaccine.
对所有药品进行副作用监测是很重要的事，但同样重要的是，接种疫苗后发生的有害事件并非都是由疫苗引起的。
The researchers found small but significant increases in several harmful effects in women who took the hormones.
研究者在服用激素的妇女组中发现很小的但是显著的很多有害反应的增加。
Animal studies have confirmed that high doses are harmful, but some evidence that it may also be harmful at low doses has yet to convince regulators to take decisive action against the compound.
动物研究已经确认高剂量的双酚a是有害的。低剂量也可能存在危害，但是还没有足够的证据让监管部门下定决心对这种化学物质采取措施。
Vitamins and minerals are essential to human life, but taking supplements in excessive amounts can be harmful, a fact many people are unaware of.
维生素和矿物质对人的生命至关重要，但是摄入过量便会有害，许多人还不了解这一点。
The mechanisms are unclear, but it may be that skin is more susceptible to the harmful effects of UV radiation during childhood.
具体机制尚不清楚，但有可能是因为儿童期皮肤较易受到紫外线辐射的有害影响。
Such algal blooms are not only harmful to people and animals but can also trigger dead zones in the lake-areas in the water so devoid of oxygen that they cannot support aerobic life.
这种水藻大爆发不仅会对人畜造成危害还会在湖水中制造死亡区域——水中的一片区域会因为氧气匮乏而完全不能供有氧生物生存。
The studies found that both positive and negative conditional parenting were harmful, but in slightly different ways.
研究表明，不管是正面还是负面的有条件关爱都是有害的。但是有细微的不同。
Jurisdictions dutifully abolished their “harmful” preferential tax regimes—but some simply extended the same low rates to everyone.
这些金融管辖区恪守准则废除了“有害”的特惠税制，但仍有一些地方仅仅扩大提供同等低税率的对象，所有人都能享受到。
Its video was briefly pulled from YouTube Saturday morning as a "depiction of harmful activities" (sic), but by 11:00 a.m. it was back up.
上周六早间这段视频曾因“描述有害活动”(原文如此)在YouTube上被短暂删除，但上午11点时又重新上线。
Its video was briefly pulled from YouTube Saturday morning as a "depiction of harmful activities" (sic), but by 11:00 a.m. it was back up.
上周六早间这段视频曾因“描述有害活动”(原文如此)在YouTube上被短暂删除，但上午11点时又重新上线。
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