| 单词 | 粉末状 |
| 释义 | 〔rust〕Any of various powdery or scaly reddish-brown or reddish-yellow hydrated ferric oxides formed on iron and iron-containing materials by low-temperature oxidation in the presence of water.铁锈：粉末状或鳞状的红褐色或黄褐色的水气含铁化合物。由于遇水而在铁上或含铁材料上低温氧化而成〔selenium〕A nonmetallic element, red in powder form, black in vitreous form, and metallic gray in crystalline form, resembling sulfur and obtained primarily as a byproduct of electrolytic copper refining. It is widely used in rectifiers, as a semiconductor, and in xerography. Its photovoltaic and photoconductive actions make it useful in photocells, photographic exposure meters, and solar cells. Atomic number 34; atomic weight 78.96; melting point (of gray selenium) 217°C; boiling point (gray) 684.9°C; specific gravity (gray) 4.79; (vitreous) 4.28; valence 2, 4, or 6. See table at element 硒：一种非金属元素，粉末状时呈红色，玻璃状时呈黑色，结晶状时呈金属般的灰色，与硫类似，通常作为副产品在电解法冶炼铜时获得。广泛地用于整流器（如半导体）和静电复印术中。其光电压的和光电导的效应使它可在光电池、照相曝光表和太阳能电池中发挥作用。原子序数34；原子量78.96；（灰色硒的）熔点217°C；沸点（灰色硒的）684.9°C；（灰色硒的）比重4.79；（玻璃状的硒）比重4.28；化合价2,4或6 参见 element〔triturate〕A triturated substance, especially a powdered drug.研碎物：研成粉末的物质，尤指粉末状的药〔smut〕Any of various plant diseases, especially of cereal grasses, caused by parasitic fungi of the order Ustilaginales that form black, powdery masses of spores on the affected parts.黑穗病：一个由担子菌目的寄生菌引起的植物疾病，多发生于各类植物中，在被感染的部份出现黑色粉末状的斑点〔sulfonmethane〕A colorless crystalline or powdered compound, C7H 16O 4S 2, used medicinally as a hypnotic. 双乙磺丙烷：一种无色结晶状或粉末状的化合物，C7H 16O 4S 2，在医学上用作安眠药 〔quercetin〕A yellow, powdered crystalline compound, C5H 15O 2(OH) 5, synthesized or occurring as a glycoside in the rind and bark of numerous plants, and used medicinally to treat abnormal capillary fragility. 槲皮苷，栎皮酮：一种黄色粉末状的晶体化合物C5H 15O 2(OH) 5，人工合成或以糖苷存在于许多植物的果皮及树皮中，在医药中用来治疗不正常的毛细血管脆弱 〔sugar〕A sweet crystalline or powdered substance, white when pure, consisting of sucrose obtained mainly from sugar cane and sugar beets and used in many foods, drinks, and medicines to improve their taste. Also called table sugar 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 table sugar〔veratridine〕A yellowish-white, amorphous powdered alkaloid, C36H 51NO 11, obtained from sabadilla seeds and from the rhizome of hellebore. 藜芦定：一种略带黄色的非晶体的粉末状生物碱，C36H 51NO È�11，从沙巴草籽和藜芦根中提取 〔espresso〕A strong coffee brewed by forcing steam under pressure through darkly roasted, powdered coffee beans.浓咖啡，爱斯普利索咖啡：把粉末状的咖啡豆用蒸汽加压煮出来的浓咖啡 |
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