upbeat adj. 积极乐观的，愉快的 (positive and cheerful) /ˈʌpbiːt/
- The café did its best to cultivate an upbeat mood by playing pop music on its radio and greeting its customers cheerfully.
uproot v. 连根拔起，消灭 (to destroy or remove completely) /ʌpˈruːt/
- The tree surgeons uprooted the diseased oak, pulling all traces of it from the ground.
upbraid v. 训斥，责骂 (to criticize severely) /ʌpˈbreɪd/
- The store owner severely upbraided his employee after finding that he had forgotten to turn on the burglar alarm.
upshot n. 结局 (the final result) /ˈʌpʃɒt/
- Many people hope that the upshot of the Arab Spring movements will be a more free and democratic Middle East.
upend v. 颠倒 (to cause to be upside down) /ʌpˈɛnd/
- When Jason hit the tree, the car upended, flipping onto its roof.
upgrade n. 升级 (an occurrence in which one thing is replaced by something better, newer, etc.) /ˈʌpɡreɪd/
- When Drake's computer became so old that it no longer successfully updated, he decided to purchase an upgrade.
upheaval n.（引起混乱的）巨变 (a major change or period of change that causes a lot of conflict, confusion, anger, etc.) /ʌpˈhiːv(ə)l/
- The last time we moved house it was such an upheaval that our lives were at sixes and sevens for several months before things calmed down.
uphold v. 支持 (to give support to) /ʌpˈhəʊld/
- When he became a police officer, Arthur pledged to uphold the law by helping to eradicate criminal behavior.
upmost adj. 最高的 (highest in position or importance) /ˈʌpməʊst/
- As President, Xi Jinping holds the upmost position in Chinese politics.
upraise v. 举起，抬高 (to raise or lift up) /ʌpˈreɪz/
- Thea leaped high into the air, her hands upraised, and hit the volleyball back over the net.
upsurge n. 增长 (a rapid or sudden increase or rise) /ˈʌpsəːdʒ/
- Cyber Monday and Black Friday are days on which mass sales traditionally drive an upsurge in retail profits.