“偶尔来访”可以翻译为 “drop in occasionally” 或 “visit occasionally”。
“drop in occasionally” 强调不预先安排、临时性地偶尔到访，语气比较随意自然。例如：My old friend drops in occasionally, which always brings me a lot of joy.（我的老朋友偶尔来访，这总是给我带来很多欢乐。）
“visit occasionally” 更侧重于描述“访问、拜访”这一行为是偶尔发生的。例如：They visit their grandparents occasionally during the holidays.（他们在假期偶尔去拜访他们的祖父母。 ）