"这个公园如此安静" 用英语可以说成 "this park is so peaceful".
"peaceful" 是英文中的形容词，意思是 "安静的"。这个词来自英文 "peace"，意思是 "和平"。
例句：
"I love coming to this park because it's always so peaceful." (我喜欢来这个公园，因为它总是如此安静。)
"The peaceful atmosphere of the park makes it the perfect place to relax." (公园的安静气氛使它成为放松的理想地点。)
"Even though the city is busy, the park is a peaceful oasis." (即使城市很繁忙，公园也是一个安静的绿洲。)