★★★
 
  how come
怎麼會
 
 
How come she broke her promise?
她怎麼會不遵守承諾?
His sister is getting married today, how come he has not
showed up yet?
他妹妹今天結婚,他怎麼還沒出現 ?

why

建議使用最佳瀏覽解析度﹕IE 5.0 以上版本 800 x 600