First, read the English article below.

Place your hand or a handkerchief over your mouth as you speak. The obstacle should be directly against your mouth to produce a more dramatic effect. Your voice, like any sound, travels through various mediums in the form of sound waves. The way that those waves are transmitted through air differs from the way those waves sound when traveled through a different medium, like a solid. By placing a solid obstacle in front of your mouth as you speak, you force the sound waves through that obstacle, thereby changing the way that others' ears hear and interpret the sound. When you speak, do so in a quieter tone and open your mouth less as you pronounce words.  Mumbling changes both word formation and the manner in which your voice carries. When you mumble, you keep your mouth more closed than usual. Certain sounds are pronounced while the mouth is only slightly opened, and those will not be affected much. On the other hand, sounds that naturally require you to open your mouth significantly more will be greatly altered. Consider the difference in sound when saying something as simple as “oh.” First, say “oh” while opening your mouth wide open. Then, repeat the “oh” syllable while keeping your lips just barely parted. If you listen carefully, you should notice the difference in sound. Mumbling also causes you to speak softer. Clear, middle sounds may come through well enough when you speak softly, but softer sounds and end sounds tend to be obscured. Consider the difference in sound when repeating a simple phrase like “got it.” Repeat the phrase forcefully in your normal tone. You will likely be able to pick up on the ending “t” sounds, even if the “t” at the end of “got” blends into the next word. Then, try repeating the phrase weakly in a quiet tone. The two vowel sounds will likely be audible, but the “t” sounds should have weakened significantly. Most people naturally speak with some degree of emotion. Focus on maintaining a flat, consistent tone of voice as you speak. The less emotion you use while speaking, the... 

Now, please write a short abstract for it in Chinese. Abstract:
掩盖你的声音。 含糊地说话。 用一个语调说话。 用不同的表情说话。 说话的时候捏住鼻子。 练习新的口音。