But because the focus of this article is on defining, calling, and displaying the results of an EJB 2.x session bean method, we kept this Cancel callback behavior simple.
但是由于这篇文章的重点是定义，调用，以及显示一个EJB 2 session bean方法的结果，我们简单地阻止了这个Cancel回调行为。
In the case of an asynchronous operation with a time-out, the callback function should be called and an exception thrown when the results of the operation are first accessed.
对于具有超时的异步操作，在首次访问操作结果时，应该调用回调函数并引发异常。
Results: Clearance rate of leucocyte filtrate after was 99.99%. Callback rate of RBC was over 90%.
结果：过滤后白细胞的清除率为99.99%，红细胞的回收率为90%以上。
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