A pair of teenage boys were smoking cigarettes...两个十来岁的男孩正在吸烟。Most pregnant women remain off cigarettes while carrying the child.大多数孕妇都在孕期戒了烟。The risk of developing heart disease increases with the number of cigarettes s...
The chronic benzolism to the skin, the eye and the upper respiratory tract has the stimulation.慢性苯中毒会对皮肤 、 眼睛和上呼吸道有刺激作用.Most of patients have aridity of nasal mucosa, burning pain, discomfortable symptom of respiratory c...
盐水比淡水的传导性强得多。Salt water is much more conductive than fresh water is.淡水和其他商品短缺。Fresh water and other commodities are in short supply.用蒸馏法从海水中提取淡水to distil fresh water from sea water...