gèng yǒu yòng de shuō fǎ shì wǒ jué de nǐ de kāi tóu hěn qīng chǔ dàn shì tú biǎo kě yǐ jiǎng màn yì diǎn

更有用的说法是：“我觉得你的开头很清楚，但是图表可以讲慢一点。

A more useful way to say it is: 'I think your beginning is very clear, but you can explain the chart more slowly.'