I can only afford to watch television for an hour gonight because I have homework to do.
因为我要做家庭作业,所以今晚我只能花一小时看电视。
You can imagine how useful this is, particularly in countries like China and Japan, which use written characters not letters.
你可以想像得到,特别是在中国和日本这些使用文字而不是字母的国家,这是多么有用处!