Zone boundary
[计] 区域边界
🧩 词语组成解析
zone
[zon]
n. 地带;区域，范围;地区，时区;[物]晶带;
vt. 划分成带;用带子围绕;
vi. 分成区，分成地带;
🗣️ 情景例句
my brother Robbie,
我弟弟Robbie
You have to be there half an hour before departure time.
你要在起飞前半小时到那里。
and realized that it was a sign that the child was growing up and developing valuable powers of observation and independent judgment,
并且意识到这象征着孩子们正在成熟和发展宝贵的观察力、独立判断力，