translation.en: And it makes a very bad microphone; I've tried it many times.  The other assumption that you made -- and this little lesson is to show you that you will make assumptions.
translation.zh: 当麦克风用它一点儿都不好使。 我试用多次了。 你们的另一个假定是-- 这只是告诉大家 你们都会假设--