C/C++实战017：fstream读写文本操作详解
.nc是数控程序文件的后缀，是辅助设计制造(CAD/CAM)时编程用的文件。里面包含了坐标系统，加工指令、辅助功能等，可以在生产过程中引导机床执行数控指令来完成产品的加工。
40篇短文高中英语3500词03 A hard trip
My sister was fond of traveling. Ever since graduating， she had been determined to organize a trip to an old temple. Since transporting fare was expensive， she decided to use a bicycle to cycle there not caring about the disadvantages. Her stubborn attitude was always her shortcoming. Once she made up her mind to do something， no one could persuade her to change her mind. Finally， we gave in as usual though we preferred to take a train. After we prepared everything， including the schedule， reliable weather forecast and the insurance， we began our trip.我们每一个人都应该是喜爱美的，这是人的本性。
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In northwestern Cambodia's Battambang province， a water supply system has improved access to clean water at affordable prices， reducing waterborne diseases among residents.
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