这里填的是：while
表示轻微转折,这个是while的用法之一
While作并列连词用,意思为“而,然而”,表对比.而but表转折.注意用心比较体会while与but的句中用意
1.Some people waste food while others haven't enough.
有些人很费粮食,然而有些人却吃不饱.
2.The son was having a good meal at home,while the parents were working in the fields
儿子在家吃好饭而父母却在田里辛勤劳作.