under perfect condition什麼意思呢?

2under prepositionDefinition of UNDER1: below or beneath so as to be overhung, surmounted, covered, protected, or concealed by <under sunny skies> <a soft heart under a stern exterior> <under cover of darkness> 2 a: subject to the authority, control, guidance, or instruction of <served under the general> <under the terms of the contract> <a program that runs under any operating system> b: receiving or undergoing the action or effect of <under pressure> <courage under fire> <under the influence of alcohol> <the image of a point under a mapping> <under oath> 3 a: within the group or designation of <under this heading> b: having as name or title <traveling under an alias> 4: less or lower than (as in size, amount, or rank); especially: falling short of a standard or required degree <under the legal age> <under par>
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See under defined for English-language learners »Examples of UNDERThey couldn't climb over the wall, so they dug a hole under it.Draw a line under each word you don't know.We sat under a tree and rested a while.I'm wearing a sweater under my jacket.The ball rolled under the car.How long can you hold your breath under water?The cafe is under new management.The army captured three forts while under the general's command.He has been under a lot of pressure at work lately.You will be under anesthesia during the operation.

under pressure