1·In violin performance, glissando is not only a technical skill, but also a way of violin music manifestation.
在小提琴演奏中，滑音不仅是一种技术性手段，更是小提琴音乐的表现手段。
2·Then, is how to do a proper glissando, do I need to move my jaw inward/outward to do a glissando?
然后就是怎样正确的演奏滑音，我需要将嘴唇内外移动来制造这个效果吗？