下面这个句子中的 on 好像是多余的:
A website may have many different web pages for you to click on and explore.
句子意思应该是:一个网站会有许多网页供人们点击和浏览。
click on 或者 click 都正确。例如:
If you want to open a file , click twice on the icon for it. 如果你想打开一个文件,双击该文件图标。
When you have selected the file you want, click the "Open" box. 选中了你想要的文件,用鼠标点击“打开”方框。(《剑桥高阶英汉双解词典》p.383)