科学时代-面向大众传播科学知识、科学方法、科学精神和科学思想的科学普及平台。

科学时代收录了46211条科普词条，基本涵盖了常见科普常识及英语词汇的翻译，是科学学习和研究的有利工具。

热门查询：

Umtali	Umtata	Un-American Committee	Unamuno y Jugo，Miguel de	uncertainty principle
Uncle Sam	unconscious	underground railways	underwing moth	underwriting
Undset，Sigrid	undulant fever	unemployment	UNESCO	Ungaretti，Giuseppe
Ungava	ungulate	uniat churches	UNICEF	unicorn
unidentified flying objects	Unification Church	unified field theory	UNIFIL	uniformitarianism
Uniformity，Acts of	Union of Soviet Socialist Republic	Union，Acts of	Unitarians	unitary authority
unitary symmetry	United Arab Emirates	United Arab Republic	United Fronts	United Irishmen，Society of
United Kingdom	United Nations	United Nations International Children’s Emergency Fund	United Provinces of the Netherlands	United States of America
unities	unit trust	Universal Decimal Classification	universal time	universe
universities	University of the Third Age	Unknown Warrior	unleaded Petrol	unlisted securities market
Upanishads	upas	Updike，John	Upolu	UpperVolta，Republic of
Uppsala	Ur	uraemia	Uralic Languages	Ural Mountains