| 单词 | upgrade |
| 例句 | upgrade verb 1.•there are plans to upgrade the rail system:improve, modernize, update, bring up to date, make better, ameliorate, reform | rehabilitate, recondition, refurbish, spruce up, renovate, rejuvenate, overhaul | bring up to code. ANT downgrade. 2.•he was upgraded to a seat in the cabinet:promote, give promotion to, elevate, move up, raise. ANT demote. |
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