The ability of coal to release a combustible gas has long been known.
煤能够释放易燃气体这一点早已为人所知。
It has long been known that the level of serum iron in animals falls during infection.
人们早就知道，在感染期间，动物的血清铁水平会下降。
It has long been known that the human skeleton constantly constructs and destroys cells, according to the stresses that its bones experience.
长久以来，人类骨骼被认为是依照其骨质经受的压力来不断构建和消灭细胞。
It has long been known that a taxi firm called AAAA cars has a big advantage over Zodiac cars when customers thumb through their phone directories.
人们早就知道，当顾客翻阅电话簿时，AAAA汽车公司比Zodiac 汽车公司有很大的优势。
The Qinghai-Xizang Plateau has long been known as the roof of the world.
青藏高原素有世界屋脊之称。
It has long been known as the best car in the world.
长期以来它被认为是世界上最好的汽车。
In contrast, marriage has long been known to mellow men out.
相反，婚姻使男人变成熟则已久为人知。
A lack of vitamin D has long been known to have an effect on bones.
维生素d的缺乏长期认为会影响骨骼。
It has long been known that there are 92 solutions to the problem.
很久以前人们就发现八皇后问题有92种解决方法。
China has long been known as the factory to the world, and with good reason.
中国长久以来已世界工厂而闻名，这是名副其实的。
It has long been known that there is a first relationship between heart and liver.
长期以来，大家知道心脏和肝脏的关系是最主要的。
Paris has long been known for stylish people, delicious cuisine and universal health care.
巴黎一直因时尚、美食和全民医保制度而闻名于世。
Scenic Lake Como, with its deep blue waters, has long been known as "the looking glass of Venus."
科摩湖风景区及其深蓝色湖水，长期以来一直被称为“维纳斯的梳妆镜。”
Gulbuddin Hekmatyar, the movement’s leader, has long been known to want to return from hiding in Pakistan.
古勒卜丁•希克马蒂亚尔，该组织的领导人一直希望可以回到阿富汗，而不必再隐藏在巴基斯坦。
It has long been known that green tea has the ability to kill bacteria and is known to deter food poisoning.
人们很久前就已经知道绿茶能杀菌和阻断食物中毒。
Its existence has long been known, primarily because of surviving anti-heretical works that denounce its tenets.
它在很早以前就为人所知，主要是因为目前尚存的批判旁经的著作中对它的观点的抨击。
It has long been known that the hunting scenes depicted on walls were not simply a form of artistic expression.
描绘在墙壁上的狩猎场面，不仅是艺术的表现形式，这一点早为人们了解。
Adolescence has long been known as prime time for developing cognitive skills for self-control, or executive function.
长久以来，青春期一直被视为赖以自制或执行的认知能力形成的黄金时期。
Sweden has long been known for having among the highest level of English language skills outside the Anglo-Saxon world.
瑞典一直以盎格鲁-撒克逊世界以外英语水平最高的国家而著称。
It has long been known that the foundations for speaking and listening to a native language are laid down very early in life.
这里很早私知道，说、听母语的基础在生命的早期私建立起来了。
IT HAS long been known in financial markets that people are so reluctant to lose money that they will take big risks to avoid it.
人们为了避免经济损失，常常甘愿铤而走险。这在金融市场上早已为人熟知。
Vienna has long been known as having a very high quality of life, but it is a city that hasn't rested on its quality reputation.
维也纳长期以来就以拥有高品质的生活而著称，但它并未因此而松懈下来。
It has long been known that chopping Onions induces tears due to a volatile gas released by onion cells when damaged by the knife.
人们很早以前就知道，切洋葱时会熏到眼睛流泪，是因为被刀切到时洋葱细胞会释放出一种易挥发气体。
Darien Library has long been known for its "extreme customer service" and for making every Darien experience the best that it can be.
一直以来，Darien图书馆都以极致的服务闻名，它致力于为每一位顾客提供最好的体验。
It HAS long been known that the air and water encountered by people in their daily lives are filled with all sorts of micro-organisms.
大家早就知道，日常生活中我们所接触到的空气和水里都包含着各种各样的微生物。
The southern seaside city of Marseille has long been known as the gateway to North Africa, which lies just across the sparkling Mediterranean.
法国南部海滨城市马赛一直是人们熟知的通向北非的大门，她跟引人注目的地中海刚好隔海相望。
Honey has long been known as a natural antiseptic and can help destroy the bacteria in the oil glands quickly, helping to speed up the healing process.
蜂蜜一直被誉为天然的防腐剂，还可以快速的杀死油腺体里面的细菌，加速愈合过程。
It has long been known to consume anything that ventures too close, and Cheng's model suggests it chews up stars at a rate of 100 every 3 million years.
长久以来，它被认为会吞噬任何靠得太近的物质，而Cheng的模型认为它每三百万年才能完全把一颗恒星消化干净。
It has long been known to consume anything that ventures too close, and Cheng's model suggests it chews up stars at a rate of 100 every 3 million years.
长久以来，它被认为会吞噬任何靠得太近的物质，而Cheng的模型认为它每三百万年才能完全把一颗恒星消化干净。
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