| understory; underwood; undergrowth |
下層植生 |
| Underwater acoustics |
水聲學 |
| Underwater biology |
水中生物學 |
| Underwater cable |
水下電纜 |
| Underwater television |
水下電視 |
| Underwriter |
承銷機構 |
| undulant jump |
波狀水躍 |
| uneven-aged stand |
異齡林 |
| uneven-aged stand |
異齡林分 |
| uniform distribution |
均勻分布 |
| uniform shelterwood system |
大面積傘伐作業 |
| Unionadea disease |
蚌病 |
| Unionidea |
蚌科 |
| unit hydrograph |
單位歷線 |
| United Nation Forum on Forest |
聯合國森林論壇 |
| United Nations Food and Agriculture Organization (UNFAO, FAO) |
聯合國糧食暨農業組織 ; 聯合國糧農組織 |
| United Nations Food and Agriculture Organization ; UNFAO ; FAO |
聯合國糧食暨農業組織 ; 聯合國糧農組織 |
| United Nations Framework Convention on Climate Change (UNFCCC) |
聯合國氣候變化綱要公約 |
| United States Code (U. S. C.) |
美國法典 |
| United States Department of Agriculture ; USDA |
美國農(業)部 |
