短語(yǔ)詞組短語(yǔ)trace amount of cobalt 痕量鈷trace amount element 痕量元素trace amount of bromide 微量溴離子trace amount of lead 痕量鉛trace amount of water 痕量水trace amount of calcium 微量鈣trace amount of cyclohexane 微量環(huán)己烷trace amount of nitrogen 微量氮含量trace amount phenol 微量酚 返回 trace amount