在这里，可以启动两种检查点——一般检查点和同步检查点。
Here, you are provided with options to initiate two types of checkpoints — normal checkpoint and sync checkpoint.
还对25名正常人和3例风湿性心脏病患者进行了同步心尖和超声心动图检查。
Synchronous apexcardiogram and echocardiogram were also studied in 25 normal persons and 3 cases of rheumatic heart disease.
示例程序将受益于一些增强功能：如使缓冲区保持同步，或者检查当内容丢失时是否必须重新绘制整个缓冲区。
The example program would benefit from such enhancements as keeping the buffers synchronized or checking if the complete buffer must be redrawn when contents are lost.
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