The obtained fattyacid is above 50% of total amount of the spentmaterial.
下脚料分离所得的产品脂肪酸占下脚料总量的50％以上。
2
He spent 27 years writing Compendium of Material Medica.
他花了27年撰写了《本草纲目》。
3
Designers spent more than one year choosing and testing ideal materials, and finally picked a new kind of material that can resist the very difficult conditions on the Moon.