Demand啥時為可數或不可數,達人請進

我知道demand是可數名詞也可是不可數名詞,但我想問我們寫句子時什麼時候demand要用可數,什麼時候要用不可數,麻煩各位達人解說一下好嗎謝謝 例外還有: 1. There is an increasing demand for pet products on the market. =>請問此句demand為啥是用可數呢?請問此句我可以寫成There are increasing demands for...嗎?這樣意思有一樣嗎? 2. The coal produced here can't meet the demand. =>請問coal與... 顯示更多 我知道demand是可數名詞也可是不可數名詞,但我想問我們寫句子時什麼時候demand要用可數,什麼時候要用不可數,麻煩各位達人解說一下好嗎謝謝


例外還有:

1. There is an increasing demand for pet products on the market.

=>請問此句demand為啥是用可數呢?請問此句我可以寫成There are increasing demands for...嗎?這樣意思有一樣嗎?


2. The coal produced here can't meet the demand.

=>請問coal與 produced中間是否有省略which is呢?此句demand是不可數嗎?是的話為啥此句要用不可數呢,也可用可數嗎?


ps:請各位大大就我的提問回答喔我會選出最棒的答案,謝謝大家的幫忙^^
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