higher term的用法和樣例：
例句
- The higher orders were retained as an infinite sum of standing eigen-waves to deal with the fields inside the grooves.
其中對槽區內的場處理，保留其高次項，表示為一無限本徵駐波之和的形式。 - We propose adding a term that is related to the fourth power of offset into the traveltime equation, and expressed it by a fraction expansion.
為此，在時距關係中增加含炮檢距的四次項，並採用分式展開法表示該四次項，同時引入遠偏移距收斂因子。
