我写这封信是为了向你表达我们的感谢之情，因为我们都从您上周所做的讲座中受益良多。
I'm writing this letter to express our gratitude to you for we have all benefited from the lecture you gave last week.
我写这封信是为了向你表达我们的感谢之情，因为我们都从您上周所做的讲座中受益良多。
I'm writing this letter to express our gratitude to you for we have all benefited from the lecture you gave last week.
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