当公园环境变得更好时，可以使用以下表达：
"The park has improved."（公园变得更好了）
"The park has become more beautiful."（公园变得更美了）
"The park has undergone a transformation."（公园经历了一次转变）
这些表达都源于英文语法和词汇，并且都能够准确地表达出公园环境变好的意思。
英文例句：
"I can't bepeve how much the park has improved since I last visited. The grass is so green and the flowers are in bloom."（我简直不敢相信自从我上次来到这里后公园变得这么好。草坪非常绿，花儿也开了。）
"The park has become a popular destination for tourists since it underwent a transformation last year."（自从去年公园经历了一次转变后，它就成为了游客的热门目的地。）
"I used to avoid walking through the park because it was so dirty and unkempt, but now it's one of my favorite places to go for a stroll."（我过去不喜欢经过公园，因为它很脏，而且修剪不好，但是现在它已经成为了我最喜欢散步的地方之一。）
"The park has improved."（公园变得更好了）
"The park has become more beautiful."（公园变得更美了）
"The park has undergone a transformation."（公园经历了一次转变）
这些表达都源于英文语法和词汇，并且都能够准确地表达出公园环境变好的意思。
英文例句：
"I can't bepeve how much the park has improved since I last visited. The grass is so green and the flowers are in bloom."（我简直不敢相信自从我上次来到这里后公园变得这么好。草坪非常绿，花儿也开了。）
"The park has become a popular destination for tourists since it underwent a transformation last year."（自从去年公园经历了一次转变后，它就成为了游客的热门目的地。）
"I used to avoid walking through the park because it was so dirty and unkempt, but now it's one of my favorite places to go for a stroll."（我过去不喜欢经过公园，因为它很脏，而且修剪不好，但是现在它已经成为了我最喜欢散步的地方之一。）