He mentions anesthesia is used to reduce the animals' pain and the experimented animals are kept in clean conditions.

他提到麻醉可以用来减轻动物的疼痛，而且被用来试验的动物都是被放在干净的环境中的。

youdao

Poverty, malnutrition, overcrowding, lack of clean conditions, pollution and limited health services are all causes of their poor health.

贫穷，营养不良，人口密度过大，缺乏清洁环境，污染和医疗设施有限均是导致健康不良的原因。

youdao

This paper presents the results of the experimental studies on the flashover characteristics of insulator strings under dry and clean conditions applied with composite voltages.

本文为绝缘子串在干燥和清洁条件下合成电压闪络特性的实验研究结果。

youdao

Poverty,malnutrition,overcrowding, lack of clean conditions, pollution and limited health services are all causes of their poor health.

VOA: special.2009.07.20

One problem is that people expect parking lots to be scraped perfectly clean and no longer dress for blizzard conditions, said Mr. Case.

WSJ: Storm Is Mixed Blessing for Snow-Removal Firms

The company innovates quickly: for instance, it has recently launched a tiny machine that washes little more than one change of clothing and was an instant hit in Shanghai, where living conditions are cramped but residents care about clean clothes.

ECONOMIST: China and the chaebol

Some experts believe autophagy, while playing a key role in keeping cells clean, may also be implicated in the development of neurodegenerative conditions such as Alzheimer's disease.

BBC: NEWS | Health | Newborn babies feed on themselves