erratic
🇺🇸
/ɪˈrætɪk/
🇬🇧
/ɪˈrætɪk/
acting, moving, or changing in ways that are not expected or usual
The car's speed was erratic, making it hard to follow.
车速不稳定,难以跟随。
a big rock that's different from surrounding rocks, left behind by melting ice
The field was scattered with erratics left behind from the last Ice Age.
该地区散布着上一个冰河时期遗留下来的漂石。