| Ultraviolet ray |
紫外線 |
| Ulva |
石純 |
| Umeboshi |
日本梅干 |
| umeboshi / Japanese salt plums / salt plums / fermented plums |
日本梅干 |
| unacceptable risk |
不可接受風險 |
| uncertainty |
不確定性 |
| unconfined groundwater |
自由地下水 |
| Undaria pinnatifida |
裙帶菜 |
| Under-forest economy |
林下經濟 |
| underbrush; understory; underwood; undergrowth |
下木 |
| underdrain |
暗渠 |
| underground cutoff wall |
地下截水牆 |
| underground water drainage works |
地下排水工程 |
| understory management |
下木栽植 |
| understory management |
林下栽種 |
| understory management |
樹下栽植 |
| understory plants |
下層林木 |
| understory; underwood; undergrowth |
下層林 |
| understory; underwood; undergrowth |
下層植生 |
| Underwater acoustics |
水聲學 |
