当我们到达海南时，可以用英文说"We have arrived in Hainan."
"We have arrived in Hainan" 来源于英语中 have arrived 这个词组，它的意思是 "到达某地"。
一些例句和中文翻译如下：
"We have arrived at the airport."（我们已经到达机场了。）
"We have arrived at the hotel."（我们已经到达旅馆了。）
"We have arrived at our destination."（我们已经到达目的地了。）