我已经在适当的位置加了注释，您可以对其进行测试。
I have inserted a comment at the location where you should perform that test.
当估算远程调用的时间时，例如，用跟踪语句，了解每一部分从哪里开始以及到哪里结束非常重要，因为这样才可以在适当的位置设置跟踪语句。
When measuring the time for a remote call, for example with trace statements, it is important to know where each part starts and ends, so that the trace statements can be appropriately placed.
多亏撞上了极大的好运气，美国宇航局恰好在适当的时间将哈勃太空望远镜恰好对准了适当的位置，在胶片上捕捉到了这些图像。
Through an enormous stroke of luck, NASA aimed the Hubble Telescope at precisely the right place at precisely the right time to capture these images on film.
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