Occurs
v. 重现（occur的第三人称单数）
🗣️ 情景例句
Have a safe trip home.
路上小心点。
People greet one another with Happy New Year.
人们相互祝福“新年好”。
Thus one simple fact, a change in the number of bison, had an effect on the whole wildlife chain of the plains.
因此，出现了这样一个简单的事实--野牛数目换的变化对平原的整个野生生物链都产生了影响。