“放松某人自己”可以表达为 “let oneself relax” 或 “relax oneself”。
“let oneself relax” 更侧重于表达一种主动的、有意识的放松行为，强调给予自己放松的许可或机会。例如：After a long day at work, she likes to let herself relax by taking a warm bath.（在工作了一整天后，她喜欢通过泡个热水澡来放松自己。）
“relax oneself” 则更直接地表达了放松自己的动作，侧重于描述放松这一行为本身。例如：He tried to relax himself by listening to soft music.（他试图通过听轻柔的音乐来放松自己。）