It is incredibly difficult to calculate how much dead stock currently goes to waste.
要计算目前有多少滞销库存将被浪费是极其困难的。
However, they found this difficult to answer because their mice kept dropping dead.
然而，她们发现这个问题难以回答，因为实验老鼠不断地死掉。
The maze was very difficult, with many blind paths and dead ends.
这个迷宫很难走，到处都是走不通的路和死胡同。
The maze was very difficult with many blind paths and dead ends.
迷宫里有很多绝路和死胡同，难度大。
The control of processes having large dead-times is usually difficult.
对象具有较大纯滞后是过程控制的一个难题。
The control of processes having large dead-times is usually difficult.
对象具有较大纯滞后是过程控制的一个难题。
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