不了解...的情况,不了解...的动态;

His mind would wander, and he would lose track of what he was doing.
他会走神,忘了自己正在干什么。
来源:《柯林斯高阶英汉双解学习词典》The farmer has so many chickens, he can often lose track of them all.
这农民有许许多多小鸡, 弄得他常常自己也数不清.
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