built-in end的用法和樣例：
例句
- Each microactuator consists of two PT arms that are jointed at the free end and connected to an anchor at the fixed end.
該微驅動(dòng)器由兩個(gè)光熱膨脹臂構成，兩者在自由端相互連接，而在固定端分別通過(guò)細橋與基底相連。 - Another theory is that having a greater mass under the fixed end of the reed somehow improves the vibratory properties of the reed itself.
還有一個(gè)理論認為簧片固定端下面較大的質(zhì)量會(huì )提升簧片的振動(dòng)特性。
