每年一次或者每半年一次的考评是不够的，他们想知道公司每星期、甚至每天对他们的评价。
An annual or even semiannual evaluation isn't enough. They want to know how they're doing weekly, even daily.
有169对35岁以下的夫妻参与了田纳西大学的此项研究，他们每半年需要填写一次调查问卷。
The study from the University of Tennessee selected 169 married couples aged under 35 and asked them to fill in questionnaires every six months.
每年换一次过滤器或者在沙尘多的地方每半年更换一次能保证你的爱车引擎自由呼吸。
By replacing your air filter annually, or biannually if you live in a dusty area, you'll ensure the engine can breathe freely.
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