coral是可數名詞嗎

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.

被稱爲黑珊瑚是因爲它黑色的骨架，但是它的脊椎卻可能是非常鮮豔的。