从中提取的松香和鞣酸是化学工业上很需要的.The risin and tannin that can be extracted from it are sought by the chemical industry.从3点钟以后,它们就燃烧着松香.From three o'clock onward they would be burning resin.在实验室内用一 步法 合成了松香改性壬基酚醛树脂.Rosin modifi...
The gym can be used by both able-bodied and disabled people.这家健身房健全和残障人士都可使用。Owners of restaurants would have to equip them to admit disabled people.餐厅老板将必须在餐厅里配备能够接纳残疾人的设施。Contact with other disabled yachtsmen of like m...