Period cost
[經] 期間成本, 當期成本
?? 詞語組成解析
period
['p?r??d]
n. 時期;（一段）時間;學時;句號;
adj. 具有某個時代特征的;（關于）過去某一特定歷史時期的;（家具、服飾、建筑等）某一時代的;
peri周圍，靠近+od道路→周期
cost
[k?st]
n. 價錢，代價;花費，費用;犧牲;[用復數][法律]訴訟費;
vi. 價錢為，花費;估計成本;
vt. 付出代價;估價;使喪失;使付出努力;
??? 情景例句
The first chopsticks were made from bone and jade.
第一批筷子是骨頭或玉制成的。
We first make our habits, and then our habits make us.
我們先養成習慣，然后習慣又左右我們。
but as the oceans have been overfished, fish has become more and more expensive.
但是隨著海洋里的濫捕濫撈，魚已經變得越來越昂貴。