davidzeng168
Theusualfoodanddrinkofapersonoranimal.饮食：人或动物的日常的饮食Aslender,elongated,threadlikeobjectorstructure.纤维：一种细长的线状物体或组织Asilvery,moderatelyhardmetallicelementthatconstitutesapproximately3percentoftheearth'scrustandisabasiccomponentofmostanimalsandplants.Itoccursnaturallyinlimestone,gypsum,andfluorite,anditscompoundsareusedtomakeplaster,quicklime,Portlandcement,andmetallurgicandelectronicmaterials.Atomicnumber20;atomicweight40.08;meltingpoint842to848=C;boilingpoint1,487=C;specificgravity1.55;valence2.Seetableatelement钙：一种银色的、硬度适中的金属元素，约占地壳中各种无素的百分之三，是多数动物和植物的基本组成物之一。自然存在于石灰石、石膏、氟石以及其它化合物之中，用于制造石膏、生石灰、硅酸盐水泥以及冶金和电子材料。原子序数20；原子量40.08；熔点842到848度；沸点1,487度；比重1.55；化学价2参见elementcalory[5kAlEri]n.=calorieAsweetcrystallineorpowderedsubstance,whitewhenpure,consistingofsucroseobtainedmainlyfromsugarcaneandsugarbeetsandusedinmanyfoods,drinks,andmedicinestoimprovetheirtaste.Alsocalledtablesugar糖：一种甜的结晶状或粉末状物质，纯蔗糖是白色的，包括主要从甘蔗、甜菜中提取的蔗糖，用于多种食物、饮料和药物中以改善其味道也作tablesugar
