half-wave plate的用法和樣例：
例句
- The directions can be obtained by removing the quarter-wave plate and following the procedure for plane polarized light or by interpolation.
可將四分之一波片卸去，並按平面偏振光法或內插法來決定其主應力方向。 - The orientation of the principal stresses relative to the directions of the polarizer and first quarter-wave plate is of course immaterial.
主應力相對於起偏鏡和第一個四分之波片方向的方位，當然是無關緊要的。
