1
there is urea in sth
There is urea in mammalian urine.
哺乳动物的尿液中含有尿素。
尿素
先理解核心含义，再看它在真实句子里的用法。
尿素
a colorless crystalline compound that is the main nitrogen-containing substance in mammalian urine, also produced synthetically for use as a fertilizer and in animal feed and plastics
There is urea in mammalian urine.
哺乳动物的尿液中含有尿素。
一种水溶性有机化合物,化学式为CO(NH2)2,由蛋白质代谢生成并随尿液排出。
A water-soluble organic compound, CO(NH2)2, formed by the metabolism of proteins and excreted in the urine.
尿素的任何N-取代衍生物,通式为(R1R2N)CO(NR3R4)。
Any N-substituted derivative of urea, with the general formula (R1R2N)CO(NR3R4).
Farmers often add urea to the soil to help crops grow.
农民经常往土壤里添加尿素，帮助农作物生长。
The lab test measures the level of urea in a blood sample.
实验室检测会测量血液样本中的尿素水平。
Urea is found in the urine of mammals as a waste product.
尿素作为废物存在于哺乳动物的尿液中。
There is urea in mammalian urine.
哺乳动物的尿液中含有尿素。
Urea is a major component of urine.
尿素是尿液的主要成分。
尿素通常为不可数名词，但指不同种类时可用复数 ureas。
Urea is used as a nitrogen fertilizer.
尿素被用作氮肥。
Not this
I bought two ureas for the garden.
Use this
I bought some urea for the garden.
urea 在此指作为物质的尿素，通常作不可数名词；复数形式 ureas 仅用于化学物种等专门语境。表达数量应说 some urea，而不说 two ureas。
Not this
The doctor tested my urea.
Use this
The doctor tested my urine.
urea 指尿液中的化学成分“尿素”，urine 才指“尿液”。表达化验尿液应说 urine；若指检测尿素浓度才用 urea。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
尿素肥料
The farmer applied urea fertilizer to the wheat fields.
农民往麦田里施用了尿素肥料。
尿素循环
The urea cycle converts ammonia into urea in the liver.
尿素循环在肝脏中将氨转化为尿素。
尿素呼气试验
The doctor used a urea breath test to check for the bacteria.
医生用尿素呼气试验来检查是否有这种细菌。
血尿素氮
High blood urea nitrogen can indicate kidney problems.
血尿素氮偏高可能表明肾脏有问题。
尿素霜
She applies urea cream to moisturize dry skin.
她涂抹尿素霜来滋润干燥的皮肤。
脲甲醛
Urea formaldehyde resin is used in some wood products.
脲甲醛树脂用于某些木制品。
Use urea naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想记忆：urea 以 'ur' 开头，像 urine（尿液），尿素正是尿液中的成分，看到 ur 就想到尿。
语域：formal 常见场景：scientific writing、medical diagnostics、agricultural fertilizer 尿素是科学术语，多用于化学、医学或农业等专业语境，日常口语中不常用。
urea 重音在后：/juəˈriə/。真正与其押韵的有 diarrhea、gonorrhea（美式读 /-riːə/）。bacteria、cafeteria、area、malaria 拼写相近，但重音或元音不同，不押韵。
Dictionary facts from ECDICT, WIKTIONARY.