| 单词 | macdonald, thomas harris |
| 释义 | MacDonald, Thomas HarrisMacDonald, Thomas Harris(1891–1957) civil engineer; born in Leadville, Colo. Between 1907–19 he developed the state highway system in Iowa. In 1919 he became chief of the federal Bureau of Public Roads, a position he held until his retirement in 1953. |
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