已知圆C和y轴相切，圆心在直线x﹣3y=0上，且被直线y=x截得的弦长为2$\sqrt{7}$，求圆C的方程．

短文改错

下面短文中有10处语言错误。请在有错误的地方增加、删除或修改某个单词。

增加：在缺调处加一个漏字符号(∧）)，并在其下面写上该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写上修改后的词。

注意：1).每处错误及其修改均仅限一词。

2)．只允许修改10处，多者（从第11处起）不计分。

    This summer I visited Yandangshan. When arriving by bus, I caught a sight of many mountains by looking through the mist, one of what was just like a sleeping baby from an angle. Later it looked like a strong man seeing from another.

    What impressed me was the sunrise. Stood on the top of the mountain, I saw the sunshine giving out all directions. The green mountain in our eyes, the clouds in the sky, and the shocking expressions on people's faces formed a beautiful picture. As for me, nature hold me totally with its power.

    The sceneries there made a great impression to me. I hope to go there again one day.