The electrocardiogram is the external measure result of myocardial electrobiology.
心电图是心肌电生理的外部测量结果。
To get true random numbers, computers have to rely on external sources, such as devices to measure atmospheric noise.
要得到真正的随机数，计算机不得不依赖外部资源，比如测量大气噪声的设备。
Browsers don't seem to currently support external or parameter entities in the internal subset, probably as a security measure.
浏览器目前似乎不支持内部子集中的外部实体或参数实体，这也许是一个安全措施。
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