For each child, this method is called twice: once for each (X, Y) dimension.
对于每个child，该方法被调用两次：每个(X, Y)维调用一次。
His imagination so abstracted him that his name was called twice before he answered.
他的幻想使他神游四海，以致在他回答前名字被叫了两次。
His imagination so abstracted him that his name was called twice before he answered.
他的幻想使他神游四海，以致在他回答前名字被叫了两次。
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