a federal law standardized the yearly start and end of daylight saving time in 1918-for the states that chose to observe it. C.During World War II the U.S. made daylight saving time mandatory(强制的) for the whole country, as a way to save wartime resources. Between February 9, 1942...
https://research.umn.edu/inquiry/post/speaking-science-five-tips-talking-about-your-work https://grad.illinois.edu/sites/default/files/pdfs/cvsamples.pdf
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