physical barrier

• 物理障碍

physical barrier的用法和样例：

例句

1. Research shows actie parental superision combined with physical barriers like four-sided pool fencing are some of the essential layers to keep kids safe.
   研究显示父母的积极监督再加上物理障碍，像水池四边的栅栏，是一些重要的保护孩子们的安全措施。