To wear simple or shabby clothes and eat coarse or poor food; to live a frugal and austere life, often due to circumstances or as a conscious choice to focus on other pursuits.
那位老教授为了将毕生精力投入到学术研究中，常年恶衣恶食，对物质生活的要求非常低
To dedicate his life to academic research, the old professor lived with simple clothes and coarse food for many years, having very low demands for material comforts.
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