Noun:

1. a plant exudate

natural for与(某人本性、作风)相符合的naturaladj.自然的；天然的；私生的natural active immunity自然自动免疫,天然自动免疫natural expense account按性质分类费用帐户natural green inhibitor天然绿色缓蚀剂natural gas utilization天然气利用natural person presence自然人存在natural cultural relics自然文化遗产natural and simple life“自然地简易地生活”natural gas measurement天然气计量natural history process自然史过程natural parthenogenesis自然单性生殖

1. Gum rosin is a kind of natural resin with high economic value.
   松香是一种具有重大经济价值的天然树脂。