drain
　　To make somebody or something weaker, poorer, etc. by using up their or its strength, money, etc.
　　drain somebody/ something 榨干……
　　My mother's hospital expenses were slowly draining my income.
　　It was such an exhausting and draining experience.
　　drain somebody/ something of something 例如本剧里的：
　　It drains me of all my energy.
　　I felt drained of energy.

　　walk somebody through something
　　To help somebody learn or become familiar with something, by showing them each stage of the process in turn.
　　就是一步一步手把手教某人做某事，或者从头到尾细致的捋顺某事让对方搞清楚。例如：
　　She walked me through a demonstration of the software.