intemal trade的用法和樣例：
例句
- One is retrospection on theories of intra-industry trade and empirical study of China's auto industry intra-industry trade.
一是對產業內貿易理論的回顧和對中國汽車產業內貿易的實證研究。 - However, China's IIT level doesn't grow rapidly with the trade volume, so it is quite important to research the determinants of China's IIT.
然而，中國的產業內貿易額並沒有與其貿易總額保持同步增長，對中國產業內貿易的決定因素的研究顯得格外必要。
