every here and there

例句：

1. 1. I need to buy every itemon the list.
   我需要买清单上的每一个项目。
2. 2. Every student should study diligently.
   每个学生都应该努力学习。
3. 3. Every timeI see him, he seems to bein a good mood.
   每次见到他，他都似乎心情不错。