How nice to hear from you again.
    很高興再次收到你的回信。
    Let me tell you something about the activity.
    讓我告訴你一些關(guān)于這次活動的細節(jié)。
    I’m glad to have received your letter of Apr. 9th.[/color]
    很高興收到你在4月9號的來信。
    I’m pleased to hear that you’re coming to China for a visit.
    很高興得知你將來拜訪中國。
    I’m writing to thank you for your help during my stay in America.
    我正寫這封信感謝我在美國你對我的幫助。