Many runners, from beginners to advanced, run a half marathon during their marathon training as a confidence booster and a way to figure out their marathon goal time.
许多跑步者，无论是新手还是老手，会在马拉松训练的时候跑半程，以此来增强自信并确定马拉松的目标时间。
They have some sort of genetic booster rocket and they seem to be functioning better for longer periods of time than centenarians.
他们具有某种遗传助推性而且他们似乎要比百岁老人在更长时期内机能健硕。
Compared with traditional design optimization method, MDO method can gain the optimum design for flight vehicle as well as the optimum thrust-time curves of booster.
与传统设计优化方法相比，MDO方法一次设计优化就可得到满足飞行器总体设计指标的最优设计，得到内外弹道相匹配的助推器最优推力-时间曲线。
This method can be used to control booster, and also can be used to measure all time parameters.
此方法可用于电动调压器的控制当中，也可用于检测有触点电器的各种时间参数。
Objective To determine the persistence of immune protection of China-made, plasma-derived hepatitis B vaccine in infants and the time table of booster immunization.
目的确定国产乙肝血源疫苗低剂量免疫保护持久性及用重组酵母乙肝疫苗加强免疫的免疫应答。
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。
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。
应用推荐