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- It is believed that the earliest feature of chronic bronchitis is excessive secretary activity of the mucous glands and goblet cells in response to the inhalation, for a prolonged period, of irritant substances in dust, smoke or fumes. 一般认为，慢性支气管炎的最早期特征是，由于长期吸入灰尘和烟雾中刺激物质而引起的粘液腺和杯形细胞的过强分泌活动。
- irritant substances 刺激性物质
- Causes and patterns vary. Contact dermatitis appears at the site of contact with an irritating substance or allergen. 接触性皮肤炎是因皮肤接触了刺激性物质或让人产生过敏反应的物质。
- The noise of traffic is a constant irritant to city dwellers. 车辆的噪音对城市居民是永无止境的骚扰。
- Substances consist of small particles called molecules. 物质是由叫做分子的微粒组成的。
- The act of obtaining usable substances from unusable sources. 废物利用从无用的东西中获取有用物质的行为
- The mixture will resolve into three simple substances. 这种混合物可分解成三种单纯状之。
- Chemicals in the body break our food down into useful substances. 人体中的化学元素把食物分解成有用的物质。
- A gaseous asphyxiant, irritant, or poison. 毒气气态的使人窒息物、刺激物或毒物
- A gaseous asphyxiant,irritant,or poison. 毒气气态的使人窒息物、刺激物或毒物
- To this class of substances belong glass and wood. 属于这类物质的有玻璃、木材等。
- It is not considered toxic, but is an irritant. 它被视为无毒，但是它是刺激物。
- The pancreas can produce substances which help in the digestion of food. 胰脏能产生助消化的物质。
- An allergy is an adverse reaction of the body to certain substances. 过敏是身体对某些物质的不良反应。
- Alcohol is a solvent of resinous substances. 酒精是树脂性物质的溶媒。
- The noise of traffic is a constant irritant to city dweller. 车辆的噪音对城市居民是永无止境的骚扰。
- Some substances resist corrosion by air or water. 有些物质可以抗空气或水的腐蚀。
- All substances are made up of atoms. 一切物质都是由原子构成的。
- Both of the substances are not made up of carbon . 这两种物质并非都由碳组成。
- This mixture resolves into two substances. 这混合物会分解成两种物质。
