As Pentium said, that's because the arguments is an array of strings, and you're trying to turn that into a string, which would result in all of the elements inside the array being separated with commas. To avoid this, you can use the .join()
method
Twitter.makeATweet(args.join(" ")) //this would separate all the arguments with a space
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…