shape description的用法和樣例：
例句
- Shape describes the form of the particle without reference to the sharpness of its edges.
形狀描述該顆粒外形，不考慮顆粒邊角的銳度。 - This shape describes the periodical appearing irregularity in the longitudinal direction with the length and height of the wave.
這種形狀描述出現周期性異常情況，在縱的方向產生一定長度及高度的波紋。
