控制，使不升起，使留级，吞下药物...

Keep down or you'll be hit by shell fragments.趴下,否则你会被弹片击中的.They hoe the garden to keep down the weeds.他们把花园里的草锄掉,阻止其生长.She is managing to keep down her spending.她在设法缩小开支....

keep down的音标：keep down的英式发音音标为：[ki:p daun]keep down的美式发音音标为：[kip daʊn]...