✔ 最佳答案
You may go and purchase that particular string from Tom Lee or any other musical-instrument retailers. After that, you may insert that string at the fine-tuning part, then, the coarse tuner. Lastly, try to tune the string will do.
One thing to look out is that you should try to purchase the string quality according to the quality of your violin. That is because if it's a cheap violin, using a very good string may not really improve the sound a lot. Hence, it'll be a waste to purchase expensive strings for that violin.