单词：ulva
音标：['ʌlvә] ；
n. [植]石莼
n type genus of the family Ulvaceae; green seaweed having a thallus two cells thick: sea lettuce
词型变化：名词复数形式 : ulvas
ulva的用法和样例：
例句
用作名词(n.)
- Studies on the chemical constituents of Ulva lactuca L.石莼的化学成分。
- Results show that Ulva P.K.Can uptake ammonia,nitrite,nitrate and phosphorus simultaneously.Ammonia removal is efficient,but the changes of COD is minimal.结果表明，孔石莼能同时吸收水中的三氮和磷酸盐，尤其对氨氮有极强的吸收作用，但对有机物的去除不明显。