and then in sentence (2) explain what problem you're going to solve in that field;
[21]东部地区是指北京、天津、河北、上海、江苏、浙江、福建、山东、广东和海南10省（市）；中部地区是指山西、安徽、江西、河南、湖北和湖南6省；西部地区是指内蒙古、广西、重庆、四川、贵州、云南、西藏、陕西、甘肃、青海、宁夏和新疆12省（区、市）；东北地区是指辽宁、吉林和黑龙江3省。，详情可参考雷电模拟器
CertiKOS: An Extensible Architecture for Building Certified Concurrent OS Kernels.，推荐阅读手游获取更多信息
So, let’s do it. Let’s make a tuning system based on the harmonics of your C string. First, we should find the C, G and E notes whose frequencies are as close to each other as possible.