Nanotubes, themselves, may be damaging to your lungs if you inhale them so VBX is a safer alternative.
如果您吸入纳米管， 它们本身可能会对您的肺部造成伤害，因此 VBX 是一种更安全的替代品。
英语百科
Visual Basic Extension
（重定向自VBX）
In computer programming, a Visual Basic Extension (commonly abbreviated VBX) or custom control, was the component model used in Microsoft Visual Basic versions 1.0 to 3.0. It is still supported in the 16-bit version of version 4.0, but was made obsolete by OCXs. VBX has also been supported in some versions of Borland Delphi.