There at the well, again he acts to defend the defenseless.

在水井旁，他再一次保护无助者。

耶鲁公开课 - 旧约导论课程节选

So again, this is a key to Moses' character, aiding the defenseless.

又一次体现了摩西性格特点，保护无助者。

耶鲁公开课 - 旧约导论课程节选

You have to inject it multiple times because the first blip that you get in immune response is not very high, you have to boost and often you have to boost again in order to get a high enough response to be protected.

你必须得进行多次注射,因为第一次注射,无法使免疫系统产生强烈反应,你得要增强免疫,通常还得再增强一次,以使反应足够强烈,从而起到保护作用

耶鲁公开课 - 生物医学工程探索课程节选