1. This medicine will last for a time, but after six months you'll need a booster. 
   这种药的效力可维持一个时期，但六个月后就需要使用增强药效的辅助剂。
2. Our vet is very efficient; he sends us a reminder when the cat is due for a booster vaccination as a matter of course. 
   我们的兽医工作效率很高，当猫要按时免疫接种时，他总给我们寄一张提醒单来。
3. More recently，NASA abandoned hope for the X-３３，a pro posed replacement for the space shuttle that was supposed to fly from the ground to orbit in a single stage，rather than using a booster rock et，because the technology never quite panned out． 
   最近，国家航空航天局放弃了研制x-３３的希望，因为它的技术一直没有得到充分验证。x-３３是被提议用来代替航天飞机的产品，原本预计它可以无需火箭推动器而仅靠单级火箭就能直接从地面飞抵轨道。

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