霍福德十佳球:求一句汉－英

如果说话者语气很强烈的要表达责怪之意，用If you have known something about the ancient china, you should know...（也就意味着“你”其实对中国的过去并不了解）
一般的陈述口气用If you know something about the ancient china, you should know...就可以！

如果你对中国的过去有所了解的话，那么你应该知道........
If you know what China used to be,you should learn that...

If You Knew Lyrics

Nina Simone

If you knew how I missed you
You would not stay away today
Don't you know I need you
Stay here my dear with me

I need you here my darling
Together for a day a day
Together never parting
Just you just me my love

I can't go on without you
Your love is all I'm living for
I love all things about you
Your heart your soul my love

I need you here beside me
Forever and a day a day
I know whatever betides me
I love you I love you I do

If you have knowledge on China's history, then you should know...

know all 万事通

If you had understanding in the past to China, so you should know...