It has a database of more than 300 exercises and warm-ups with step-by-step pictures; more complicated exercises are accompanied by how-to videos.
它拥有一个超过300种分步图式的锻炼方法和热身方法的数据库；更多复杂动作的会配有视频。
The penicillin fermentation process is a very complicated biochemical process accompanied with secondary microbial metabolism, which is affected by many factors.
青霉素发酵过程是一个具有二次微生物代谢的生化过程，机理复杂，影响因素繁多。
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