| 单词 | arbor day |
| 释义 | Arbor Day in American English a tree-planting day observed individually by the states of the U.S., usually in spring Arbor Day in American Englishnoun a day, varying in date but always in the spring, observed in certain states of the U.S. by the planting of trees Word origin [1870–75, Amer.]This word is first recorded in the period 1870–75. Other words that entered Englishat around the same time include: billing, fifth wheel, linkage, onshore, upgrade |
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