coral是可數(shù)名詞嗎

　　例句:

　　The scientists said that about half of the coral species were new to them.

　　科學家們說大概超過一半的珊瑚物種對他們來說都是新的。

　　It is called balck coral because of its balck skeleton, but its spines can be very bright colours.

　　被稱為黑珊瑚是因為它黑色的骨架，但是它的脊椎卻可能是非常鮮艷的。