rosin

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rub rosin onto, as of violin bows.
用松香涂在小提琴的弦弓上。
a bag filled with rosin; used by baseball pitchers to improve their grip on the ball.
装树脂的包；帮助棒球手握紧球。
The rosin and tannin that can be extracted from it are sought by the chemical industry.
从中提取的松香和鞣酸化学工业上是很需要的。
My fingers caressed its golden wood. I tuned the strings, miraculously still intact, tightened the bow, and put rosin on the dry horse-hairs.
我的手指轻轻地抚摸着金色的琴木，令人惊喜的是，琴弦仍然完好无损。我调试了一下琴弦，紧了紧琴弓，又往干巴巴的马尾弓上抹了点松香。
A durable, washable material made in sheets by pressing a mixture of heated linseed oil, rosin, powdered cork, and pigments onto a burlap or canvas backing. Linoleum is used as a covering especially for floors.
油地毡，漆布一种耐久、可洗材料，在粗麻布或帆布底衬上，通过在褥单上把加热的亚麻籽油、松香、软木粉和颜料的混合物压制粗麻布或帆布底衬上而制成，通常用于铺地面

专业解释：数学物理化学生物环境信息工程健康地球交通其他
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