The 30 to 50 American troops stationed at Point Alpha were on call 24 hours a day for six weeks at a time and were rarely permitted to leave their base during that period.

在阿尔法哨所有30—50名美军人员，他们24小时执勤，每六周轮换一次，在此期间基本不允许离开基地。

youdao

The general limitation period is three years alpha on the day after the day the obligee knows or ought to apperceive the facts as a aftereffect of which the obligee's right can be exercised.

个别时效期间为三年，自债权人知道或应当晓得导致其可以行使权利的事实之日的越日起盘算。

youdao

Currently a drug called interferon alpha-2b is given to patients for a 48-week period.

BBC: Better treatment for Hepatitis C