First, read the English article below.

Vocalists typically spend years training to perfect their skill. Do your best to master your current vocal range before attempting to expand it.  Whenever possible, work with a professional voice teacher to help guide you. These experienced teachers are likely to pinpoint the exact ways in which you can improve.  They can also teach you methods of protecting your voice and steer you away from damaging techniques. This is especially important if you are attempting to add to your vocal range, as you will be purposefully testing your limits. To find the right voice teacher, do an online search for teachers in your area. Ask for recommendations from friends and acquaintances, then narrow your search by choosing teachers who specialize in the area you want to improve. Meet with at least 3 teachers to determine which one you connect with the best. Your vocal cords will be relaxed and loose while singing low notes. To help keep them in great shape, use a personal humidifier before you begin warming up. You can also use it after exercising your vocals. This device is like a sauna for your voice and will help keep it in good shape. . Before singing, always make sure to warm up first. A good vocal warm-up will release tension and prepare your voice to use its full vocal range.  Take a few breaths. Keep your posture upright with your shoulders and chest low and relax. Breathe normally and focus your attention on the muscles of your chest, neck, and shoulders. Are any of these tense? Keep breathing and focus on relaxing these muscles. Practice your scales. Sing a few notes, starting in a low pitch and ending in a high one. Do the same, only from high to low this time. Do this with a few different sounds (such as "oo," "me," and "e"). Make a "kazoo" buzz. Round your lips, inhale, and then exhale while making a "woo" sound at a single pitch. There should be a slight buzzing. Do a few scales like this. While there are steps you can take to train your voice, there is a practical limit to how low you can get your voice to go.... 

Now, please write a short abstract for it in Indonesian. Abstract:
Bangun teknik yang baik. Sempurnakan pernapasan Anda.  Lakukan pemanasan suara Terima batasan Anda.