moving target

剑桥词典

something that moves while someone is trying to hit it
移動的目標
Could you hit a moving target with a football ? 你能把球踢中一個移動中的目標嗎？

something that is always changing , making it difficult to count , describe , achieve , etc.
一直在變動的事物（導致難以清點、描述或獲得）
The population at risk of hypertension is a moving target . 有高血壓風險的人群一直在變化。 返回 moving target