What they do: Astronomers use their physics and math skills to study the universe and its origin, which includes galaxies, solar systems and the planets within.
他们的工作：天文学家利用他们在物理学和数学方面的能力来研究宇宙和它的起源，包括银河第、太阳系以及其中的行星。
Generative grammar studies knowledge of language: its nature, origin and use.
生成语法研究人类语言知识的本质、来源和使用问题。
The thesis describes systemically in threefold: the origin of acrylic painting, its use and spread in China, the relationship between acrylic painting and national wall painting style.
本文系统性地阐述了丙烯画的历史源流、丙烯画在中国的传播与应用，以及丙烯画与民族壁画风格问题。
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